Don’t worry if your Wi-Fi tends to be spotty because this monitor operates on a secure radio frequency. Parents applaud its long range — up to 590 feet — and sensitivity to sound no matter where they are in the house. And if you’re in a far-off room, you’ll still know the temperature in the nursery because it’s displayed on the screen at all times.

At over $200, are advanced audio/video monitoring systems with multiple cameras and receivers with large screens, as well as the ability to connect to several mobile devices. While they are loaded with features, it’s important to look closely at the audio and video quality. Expensive monitors are just as susceptible to interference as inexpensive ones.


If you aren't interested in having a video baby monitor, the VTech DM221 is the very best audio-only monitor you can buy. You can listen in on your baby or get vibration and light-based alerts when the monitor is in silent mode. The five LED lights indicate the level of sound so you can tell whether your baby is cooing quietly or shrieking for mom and dad.

Portable Base Unit with Good Range: Babies go to bed earlier than parents, and they also nap during the day. Unless you want to spend your time sitting next to the baby monitor base unit watching the video stream, you're going to want a unit that has far range and good battery life. This will let you take the unit and, say, take out the trash or let the dog out, while still being able to see your baby. Better yet, many of our best-rated baby monitors are completely wireless and operate by running iPhone or Android apps on your smartphone to wirelessly view the digital color video stream wherever you are. In this way, you're no longer buying a camera and monitor, you're only buying the same cameras that modern security cameras use. This gives you a more universal baby monitor and makes portable wifi baby monitoring more convenient than ever, and we're definitely in support of this new trend. Want to keep an eye on your child while you're on date night? No problem, but only with one of these modern systems.


For parents who want to monitor their baby’s cries from the office, or the gym, or Tahiti, the BB-8-looking iBaby M6S syncs right up to your house Wi-Fi connection ⏤ so instead of using a dedicated handheld receiver, you watch all the action on a smartphone app. It offers impressive 1080p HD video (with record function), a 360-degree view with 110-degree tilt, and an array of high-tech sensors including motion, sound, in-room temperature, air quality, and humidity. The only thing it seemingly won’t do is fix your X-Wing fighter. Although it makes up for it with night vision, two-way talk, and 10 programmed lullabies and bedtime stories, to which you can even add your own voice.


Microphone sensitivity: There’s a difference between hearing your baby cry, and hearing every little noise. All baby monitors have the option to turn down the volume, but some offer thresholds for parents who are more comfortable with only hearing the biggest upsets, and prefer not to hear the self-comforting noises their baby makes as they fall asleep.
Bottom Line Fun Wi-Fi option with lots of features that is easy to use and has true to life images we love Really cool camera with lots of uses and great video for simple baby monitoring Budget friendly Wi-Fi camera with nice images, but potential delay of varying length Our favorite dedicated monitor with impressive range that is very easy to use A budget friendly dedicated monitor that gets the job done well without all the fluff
Movement products are designed to sense the movement associated with a baby breathing. These products attempt to discern when your little one has not moved within a prescribed period that could indicate that they have potentially stopped breathing. While this may seem like a no-brainer option for parents worried about Sudden Infant Death Syndrome (SIDS), they are not foolproof, have not been approved by the FDA as a medical device, and are known to have false alarms where the baby is fine but then suddenly awakened by a loud alarm. While it is an interesting kind of product, we caution parents that this type of device is not a substitute for safe sleeping practices and doesn't prevent SIDS. However, if you are willing to accept false alarms, it can provide another layer of monitoring to help some parents sleep better at night. Movement sensing products are only useful until babies start to roll over, at which point they become unreliable.
Aimee is a pediatric occupational therapist practicing in the neonatal intensive care unit and pediatric out-patient at Central Pennsylvania Rehab Services at the Heart of Lancaster Hospital. She has been working in pediatrics for 18 years and is also the owner/operator of Aimee’s Babies LLC, a child development company. Aimee has published 3 DVDs and 9 apps which have been featured on the Rachael Ray Show and iPhone Essentials Magazine. Also certified in newborn massage and instructing yoga to children with special needs, Aimee Ketchum lives in Lititz, PA with her husband and two daughters.
Summer Infant has been making high-quality, reliable baby monitors for many years. One problem with the Summer Infant monitors is that it's difficult to figure out which one has the features and quality you want, given the very wide range of options. Some are much better than others, and this is definitely one of the better ones we've tested. This color baby monitor has a high-quality 5" high resolution LCD display, which is a similar quality to the Project Nursery monitor in terms of color, contrast, and brightness. When we first got our hands on this, we were excited that maybe it was a nice wide angle panorama camera. But it turns out what they meant by "panorama" is that you can remotely tilt, pan, and zoom. The panning does go nice and wide, allowing you to swing the camera side to side about 180-degrees. But the camera angle itself is no different than the other monitors on this list. That being said, this is a great baby monitor with some great features. In addition to being able to remotely pan, tilt, and zoom the camera, some of the best features were: 1) a subtle night light that you can turn on/off remotely, and can choose it to glow with a soft blue or red color, 2) a sensor that tells you the temperature of your baby's room at all times, 3) a sound-activated light bar on the top of the receiver that tells you when there's noise in the room (even when volume is off). We thought the big hand-held unit was great, with a convenient kick-stand to put it anywhere in the house, great battery life, and good range. We were able to walk around in the backyard with this unit and still get a good, stable image. Note that you can add an extra camera to this, and it will cycle through the two cameras automatically (it does not do split-screen to see both at once). Downfalls? Well, the night vision isn't quite as good as with higher-ranked monitors on this list, and even the lowest volume level seemed really loud for sleeping parents. Also, even though the screen is nice and big, the digital video quality is sub-par relative to several other options on this list. Overall, this is a great addition to our best baby monitor list, as it has great features and falls in the middle of the price range. For about the same price, we'd go with the Infant Optics or Samsung option, unless you value the larger screen size.
Encrypted Wireless Communications: Here's something creepy and strange - there are reports of people tapping into even the best baby monitors and getting some bizarre pleasure from watching your baby sleep or watching you feed the baby in the middle of the night. A few of the manufacturers have included wireless encryption on their systems to make this much less likely.
The iBaby M6 is your ultimate nursery assistant! This adorably sleek model wins our top pick for the best baby monitor with wi-fi. Not only can you keep tabs on baby through your iPhone or tablet, the iBaby monitor also allows you to live-stream footage to as many as four people (Hello, Grandma!), take, store and share photos of baby, and speak or sing to baby via two-way communication. Parents can remotely control the camera so that it swivels, tilts and pans for a larger viewing area. Baby’s first robot? We think so!

Many of the baby monitors we've tested are internet-connected, letting you watch infant with your phone or tablet through an app just as if you were checking a home security camera. Because of this, you might not actually get a standalone display to go along with the camera. They aren't out of the question, however; some camera-only baby monitors offer viewers as an add-on or in a bundle. And if there aren't any available, you can simply get an inexpensive tablet like the Amazon Fire to use as a dedicated viewer.
It should come as no surprise that we selected Nanit as the best baby monitor overall—after all, it was the winner of The Bump Best of Baby Awards this year. Nanit gives you both a clear, unobstructed view of baby thanks to the over-the-crib mount as well as sleep insight reports and nightly sleep scores via an app. You not only see how baby sleeps, but learn how to help baby sleep better.
It uses 2.4GHz FHSS technology that offers a private connection between the monitor in your baby's room and the dedicated viewer in your hand. The FHSS connection should minimize interference, and most reviewers say the audio is clear. In BabyGearLab's testing, the reviewer found that the Phillips AVENT had the best audio signal of any of the monitors it tested.
This is an excellent baby monitor that uses many of the same principles as the Nanit, Nest Cam, and Cocoon Cam. It uses a cute and innovative video camera on a flexible stick that can hook around the top of the crib, bend into an upright stand, or mount onto the wall with an included mount. This versatility is great for the different stages of development, and it can be flexibly used as a security camera or baby monitor. For new babies that aren't old enough to stand up and grab the camera, it can be mounted right on the crib's upper rail, giving you the perfect view onto your sleeping baby. Then for child safety, it can be moved to the wall or on top of a nearby dresser, to stay out of baby's curious hands and give you a good vantage point into the crib. The camera hooks into your existing home wifi, and you use your smart phone to connect (there's a cell phone app for the iPhone or Android). If the camera and your phone are both connected to your home wifi, you will get real-time streaming within your home, and you can turn on privacy mode to keep the signal from traveling to the cloud for processing (i.e., it will stay in your local area network, the signal never leaves your home). This makes the stream much faster, but also makes sure that it will still work during an internet outage. When you leave your house and connect to your cellular carrier or to a different wifi, the camera's signal will travel through Amazon's cloud computing service then get bounced down to your phone's app. The cloud computing does two things. One is that it makes it possible for you to remotely connect to see your live camera wherever you are, as long as you have your phone. Second, it will analyze the sound to check for crying and send you an alert when any fussing is detected. And it seems pretty specific to crying, rather than sending alerts whenever there is a little other noise (like a door closing). It also saves little 30-second video clips from when the crying was detected, so you can go back (like with a DV-R) and see what was going on. Nice touch! And that cloud service is completely free to you, paid for by Lollipop. The digital video is streamed in high definition (720p), and we found that it has generally good video and digital audio sound quality. Even the night vision is really pretty great. One of the features we really liked, and we didn't find on any other wifi baby monitor, was the ability to stream just the audio overnight (audio mode for night nursery). So your smart phone screen can be off, and you can just use it as a basic audio-only monitor; that's a nice feature to save your phone's battery life and keep the bright screen from turning on in the middle of the night. In our testing, this worked really nicely, but it's worth noting that it only works in this mode when you are on the same wifi connection as the baby camera (i.e., you're at home). We found the video quality to be very high, though the "real-time streaming" did sometimes get a little delayed by a few seconds, especially when streaming through the cloud to our iPhone on a 4G connection. A few cool things worth mentioning. Mounting was easy, no more drilling into the crib or using adhesives. You can buy a separate sensor for about $55 that will tell you some additional information about your baby's room, like room temperature sensors, and air quality and humidity sensors; it connects to the camera via Bluetooth. You can also play sounds for your baby through the app, like white noise, trickling water, or even the sound of the vacuum. You can also setup multiple cameras to view on the same app (not at the same time though). So there are tons of great features here, and overall we thought it worked really well in our testing. Drawbacks? Well, it is a little pricey coming in around $150, just like the Cocoon Cam. It also can get pretty laggy when streaming through cellular networks, but that's not really Lollipop's fault. Note that the one currently available on Amazon as of July appears to be a knock-off Lollipop camera, in the meantime, you might need to purchase one directly through the Lollipop website. This camera deserves a much higher spot on our list, but we're worried about where you can actually get a genuine version of the monitor - we're in touch with the company and will update when we hear some news. So overall, this is a great new baby monitor with wifi that you will very likely be pleased with. We'll update this article in 6-months to talk about long-term reliability. Interested? You can check out the Lollipop Baby Monitor here.
Battery: We wanted a monitor battery that could last overnight, or at least eight hours, without being plugged in. We thought the ideal product would automatically cut off an idle display screen to conserve battery, work at least a few hours unplugged with the screen on, and recharge fairly efficiently. We made a rechargeable battery a requirement. We preferred units designed to connect to power via a standard USB connector, and looked for reports that the baby monitors could reliably charge, recharge, and hold a charge long-term—a disappointingly rare ability in baby monitors.
Withings features a high-quality 3-MP video sensor that gives clear and unfettered footage of the baby. With special features such as high-resolution digital video, image stabilization, a wide-angle lens, zoom capabilities, and more, you can position the camera in the nursery and not have to worry about constantly repositioning it. In addition to working on Wi-Fi and 3G/4G networks, Withings offers bonus features like a two-way speaker, infrared lighting, the ability to remotely turn on lullabies through the camera itself, motion detection, and room temperature and humidity monitoring. All of this monitoring is done through the complementary Withings apps for iOS and Android.
Will Greenwald has been covering consumer technology for a decade, and has served on the editorial staffs of CNET.com, Sound & Vision, and Maximum PC. His work and analysis has been seen in GamePro, Tested.com, Geek.com, and several other publications. He currently covers consumer electronics in the PC Labs as the in-house home entertainment expert... See Full Bio
This is the baby monitor that everybody wants to love, with its unique and cute style, its wifi capability, and its huge list of awesome features. The iBaby M7 is the newest addition to the iBaby Care line of wifi baby monitors, released in 2018 and slowly gaining traction and popularity among discerning parents. It builds upon the popular M6S baby monitor by adding a few features, including support for both 2.4GHz and 5.0GHz wifi signals (dual band), a moonlight soother projection system, air quality sensor, and diaper and feeding time alerts. When we setup the camera and installed the app on our Andoid device (also compatible with Apple iOS), we first had some difficulty getting the camera to connect. It turns out that our camera was too far from our wireless router - the manufacturer recommends that the camera is within about 15-25 feet of the router or it will have a poor connection. As a little hint, there is a black reset button on the back of the camera, and if you hold it down for about 45 seconds you'll hear a little jingle and that will reset it. We needed to use that trick to get it working. Once we got it working, it was easy to add the iBaby camera to the app and we were off to the races. And we were impressed with all the features. You could play lullabies, music, white noise, and even bedtime stories like Mother Goose (though the Jack be Nimble option wasn't so calming for bedtime!); you can even add your own music to the options, which is a really cool capability. Up on top of the camera is a little projector that will beam the "moonlight soother" projection onto the ceiling; it can be still, rotating, or off completely. Another hint is that the "help" button on the camera unit will actually turn the projector on or off when you don't have your mobile device. Additional features include motion alerts, temperature and air quality alerts, and diaper and feeding alerts (which once we set up, were actually pretty useful rather than having them on a different app). Speaking of the app, we actually liked it quite a bit - it was intuitive, reliable, and easy to use. Multiple users can access it simultaneously from different devices (use the "Invite & View Users" option), and the same app can be used to cycle between different iBaby cameras you have set up around the house (even the older M6 model can also be added). We thought the video quality was very good, it uses high definition and its night vision was clearer than many of the other options on this list. You can have your device's screen off and the app will prompt an alert when there is noise or movement, so you don't need to keep your phone's screen on all night. The app also lets you save photos and videos to your device, and you can be confident with its security because it's streaming encrypted to the state-of-the-art Amazon AWS servers. So we said it's the baby monitor everyone wants to love, and it should be clear why - the features are truly remarkable, especially for a wifi baby monitor that is only about $170. The only major downfall of this wifi camera system is the connectivity: you need to have it very close to your home's router for it to get a good connection, and it can be finicky with connectivity at times. Once it's connected, we were really happy with it, but it did intermittently disconnect at times which was definitely frustrating. So overall, this is a feature-rich wifi baby monitor that has some great things going for it, and is worthy of this spot on our list. Once they get the connectivity issues fully resolved, this will definitely creep up higher on our list. Interested? You can check out the iBaby Care M7 Baby Monitor here. 
If your internet goes down, your baby monitor goes down. A wifi baby monitor uses your home's internet connection to communicate to servers, then to your app. So if your internet connection goes down, then you will no longer be able to stream video of your baby. That's a huge consideration to keep in mind because you never know when your internet will slow down or simply stop working for several minutes or hours, and you will be stuck without a working baby monitor. There are a few wifi baby monitors that will still communicate locally (within your home's network) when the internet goes down, such as the Lollipop or Nanit. They do this by switching from internet to local area network when an outage is detected, so you can have confidence that if you're connected to your home wifi you'll still see your baby.

How far away baby's monitor can be from the parent unit is what determines a product's range. While many manufacturers offer a "line of sight" range to describe a monitor's range, it is not a good indication of how well it will work in your home with walls and interference. It doesn't matter how much you like a specific model or brand, if it doesn't work in your house, it simply isn't going to work. We tested both indoor range and open field tests to provide the best information, but remember that the values inside your home matter more than those in an open field, unless of course, you are leaving a baby alone in an open field (which we don't recommend).
The handheld unit's 5-inch screen is the largest in our review, complementing the camera's wide-angle lens. However, its resolution is the same as smaller units, so the video quality, while acceptable, is poorer. Also, you can't move the camera remotely, a feature you may not use if you only watch your baby as they sleep. The Wide View 2.0 makes up for its video quality with a user-friendly design. It only takes a few minutes to set up and a couple hours to charge the handheld unit. The handheld unit lets you adjust the volume and has an uncomplicated menu. This simplicity comes at the cost of common features – the Wide View 2.0 doesn't track room temperature, and it can't play lullabies through the camera unit. Because this is a simple video monitor, the battery lasted nine hours before it needed to recharge during our tests. The overall best baby monitor, the Infant Optics DXR-8, went 10 hours before shutting off, so this is a very good result. The Summer Infant Wide View 2.0's handheld unit has a limited indoor range compared to most other baby cameras – it’s good enough for most homes but insufficient in particularly large ones. Summer Infant offers a one-year warranty, which is average for video baby monitors.
Netgear brought the best features of its Arlo line of home security cameras to its first baby monitor. That includes Full HD video, night vision, sound and motion detection, two-way audio, 24/7 recording, and free cloud storage. Netgear also used feedback from Arlo owners to add a nursery-centric spin to the Arlo Baby, with a multicolored LED nightlight, a built-in music player with nine lullabies, environmental sensors, and artificial intelligence that can recognize your child’s cries.
Another prominent Wi-Fi–enabled monitor is the Withings Home video monitor, which we dismissed without testing. This is The Nightlight’s pick for the best video monitor. The most notable drawback to the Withings is that currently more than a third of Amazon reviewers give it two or fewer stars (out of five), citing problems similar to what you see on most other Wi-Fi video monitors: bad connectivity, a bad picture, unreliable air-quality sensors, and issues with overall quality and durability. In reply to some of the negative reviews, Nokia stated that it was looking into making improvements to this model. The rebranded version, the Nokia Home Video & Air Quality Monitor, was recently released and has not yet received many reviews (the app has mixed reviews).
Adjustable Camera Pan/Tilt/Zoom: One of the most annoying things that can happen when you're using a baby monitor is closing the door and then turning on the video monitor only to realize that your camera isn't aimed at the baby at all, and you can't see a thing. Most of the baby monitor systems would require you to go back into your baby's room and manually adjust the camera. Some of the systems we review below have remotely adjustable camera angles, so you can pan side-to-side, tilt the camera angle upward/downward, and zoom in or out, without having to go back into your baby's room. Super convenient, and a critical feature to stay at the top of our best baby monitor list. It's also nice to have a relatively wide-view camera, like the Summer Infant wide baby monitor, so that even if you don't have wireless camera panning and tilting, the odds of still seeing your baby are pretty high if you have a wide-angle camera.
iBaby makes a really confusing range of baby monitors. From cheapest to most expensive this includes the iBaby Monitors M2, M2S, and M2 Plus, iBaby M6, M6T, and M6S, and the new iBaby M7. The M2 series is usually under $100 and is pretty poorly reviewed overall. The M6 series is usually about $125 and is decently reviewed. Finally, the new M7 is brand new and only differs from the M6S in that it has a smell detector and night sky projector that can shine the moon and stars onto the ceiling (our review of the M7 is above). There's truly a lot to love about the iBaby M6S. It looks great, is pretty easy to setup, and has a ton of appealing features. Some highlights are that it uses 1080p high definition video, it senses room temperature and humidity levels, has an air quality sensor (measures the presence of volatile organic compounds or VOCs in the nursery), is dual band wifi compatible (2.4 and 5GHz), and a two-way intercom. It also can record HD videos, remotely pan (rotate) and tilt up/down, and you can setup alerts for motion, sound, and VOCs (from 1 to 4 with 4 being best). So it basically has everything that might be on your list of baby monitor essential features, and we were really excited to set it up. Out of the box, we found it easy to download the app to our smart phone (Android or Apple), connect to the monitor and connect it to wifi, and get things up and running. A couple notes here - first, your wifi password needs to be shorter than 32 characters or the app won't accept it, and second, there is no way to manually set an IP address for the camera. When we used it on our home wifi network, we found that the images were clear and decently fast (low lag), and the night vision was high-quality and not too grainy. We especially liked the pan and tilt features from the app, which allows you to move the camera's view angle around without going into the nursery (and it uses a cool screen-swipe gesture to do it). Once we left our home's wifi connection and tried to connect to the camera from a 4G LTE or a different wifi network, that's when we started to run into problems. It was choppy and laggy, which to be honest is what we expected when attempting to stream 1080p HD video outside of your home network. So we changed the resolution settings on the app (Settings - Display Settings - Resolution) to downgrade it to a lower quality stream; that seemed to help a bit. We also had difficulty connecting to the camera at times, whether we were at home or elsewhere, which was one of the more frustrating things about the iBaby Monitor M6S. The temperature and humidity sensors seemed to work pretty well, and we confirmed their accuracy with a separate thermometer and hygrometer (they were pretty decent in accuracy). For the two-way intercom, the speaker in the camera seemed pretty poor quality so it was hard to hear my voice when attempting to speak to (or sing to) our baby. Finally, we had some issues with alerts coming through to the app as intended. We setup the temperature, humidity, and VOC alerts, and had really intermittent alerts when we tested them out. The temperature and humidity sensors seemed to be reading just fine, they just weren't reliably triggering an alert when they deviated from a range. For example, we set a temperature alert for 80 degrees then blew a hair dryer at the camera; it warmed way up, but the alert wasn't triggered, so that was frustrating. We didn't test the VOC sensor, though one could imagine you could open up a can of paint next to the camera and see if it sends an alert. So overall, we have a decent wifi baby monitor that has some excellent features but also leaves a lot to be desired in the reliability department. Interested? You can check out the iBaby M6S Baby Monitor here. 
The audio is quite good as well, with very little distortion. As with other Wi-Fi video baby monitors, there is lag as the video stream travels through distant servers before reaching your smartphone. In our tests, the SCD860 had good results one moment and issues shortly after. This is one of the reasons we gave it a low score for connection quality. A few of our testers had trouble setting up this baby camera using the smartphone app. The camera doesn't work without a wireless connection, unlike traditional video baby monitors that use a handheld receiver. The app is easy to use, and it lets you set up push notifications and adjust the sound sensitivity. We had a few connection issues independent of our Wi-Fi connection, which could cause concern. For a time, we had no connection, so we didn't know what was going on in the other room. This monitor lets you track the temperature and humidity in your baby's room and has a nightlight with multiple light color options. If your baby is upset, you can use the app to talk to them or play one of the 10 lullabies through the camera's speaker. The Philips Avent Smart baby monitor SCD860 has a two-year warranty, which is the longest of all the models we tested.

The Snuza Hero SE is a wearable device that clips to baby's diaper or bottoms. It has a unique vibration alert that attempts to rouse little ones into moving enough to stop the impending alarm that will sound audibly if the baby doesn't move. This vibration feature means that false alarms may be less likely to result in a crying baby, though they could cause lack of deep sleep if they happen continually. The Snuza is a nice wearable choice that is easy to use, portable, and didn't have many false alarms during our testing. While it is not a replacement for safer sleep practices, it could provide some parents with increased peace of mind for a better night's sleep.


They don't own a broadcasting network, like CBS does -- they're that much more dependent on global partners to make their streaming shows widely available.That's not what's going here. What's going is that Disney, AT&T (owner of DC now), Apple, Comcast, and CBS are all trying to get a global streaming platform up and running in time to beat out all the other guys and compete with Netflix. But nobody is bold or stupid enough to go global on day one so they need to make content for domestic streaming and then license content to Netflix or Amazon for the time being.Broadcast is effectively dead, and all these corporations know it. They're not worrying about broadcast. They are worrying about how to finesse their transition to the world that Netflix made.
But these nursery essentials can be as fussy as the babies they keep tabs on. And like virtually every other household appliance, they are growing increasingly more capable and complex. In addition to conventional video baby monitors that use a camera and a handheld LCD display, often called a “parent unit,” there are now also Wi-Fi-enabled systems that connect to your home network and use your smartphone as both the display and the controller, much like DIY home security cameras. These latter models offer high-defition video, intelligent alerts, and the ability to check on your child from anywhere you have an internet connection.

What baby video monitors are the best? After researching over 50 video monitors, we purchased the top 9 video options and put them through a series of rigorous tests to compare the range, sound clarity, video quality, ease-of-use, and more. Our testing process and hands-on side-by-side analysis are designed to sort through and determine which baby monitors will meet your families needs and budget. Our detailed information will help you decide if you want a Wi-Fi capable unit or a dedicated monitor and which features are necessary for your needs. Continue reading and let us help you find the best monitor for your baby.


Baby monitors are just one way to keep track of your little one. For newborns, the Snoo Smart Sleeper is a bed that gently rocks your baby for better sleep, and connects to an app on your phone that lets you receive alerts when your little one needs attention. The Owlet Smart Sock 2, meanwhile, is a connected pulse oximeter that allows you to check on your baby's vitals any time through an app, and will notify you automatically if there's a problem. The Sproutling from Fisher Price is a motion and heart rate sensor that straps to the back of your baby's calf and collects data while he or she sleeps.
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