Sleep & Monitoring
Smart socks and clip-on monitors that track breathing movement, pulse or oxygen, rated honestly with the UK safer sleep context.
Best first
The most complete smart sock on sale in the UK, with proper medical certification behind its readings.
Best for Parents who want pulse and oxygen readings with alerts on a base station and their phone, and who trust themselves not to watch the numbers all night.
A certified medical device that does one job well, for about a third of the price of a smart sock.
Best for Parents who room-share and want a simple, medically certified breathing movement alarm with no app, no Wi-Fi and nothing to charge.
The Dream Sock plus a sharp 2K camera in one app: the full kit, at a full-kit price.
Best for Parents who want a smart sock and a Wi-Fi video monitor anyway, and like having everything in one app.
No sensors, no batteries, just patterned cotton, as long as you already have the camera to read it.
Best for Nanit Pro owners who want breathing-motion alerts without putting any electronics on their baby.
A clip-on tracker with handy rollover and temperature alerts, but a wellness gadget rather than a medical device.
Best for Parents who mainly want to know if their baby has rolled onto their tummy or is getting too hot, and are happy with a phone-based system.
An app-connected clip-on that its own maker says doesn't monitor breathing. The Hero MD is the better buy.
Best for Parents of older babies and toddlers who want movement, position and temperature information from a clip-on, and understand it isn't a medical device.
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Side by side
Tap a column to sort. Scores are out of 10.
| Product | Links | |||||||
|---|---|---|---|---|---|---|---|---|
| Owlet Dream SockGold Star | 7.6 | 7.3 | 8.8 | 7.6 | 8.2 | 6.0 | £280 | Amazon |
| Snuza Hero MDValue Star | 7.5 | 7.6 | 9.0 | 6.8 | 5.5 | 8.4 | £95 | Amazon |
| Owlet Dream DuoSplurge Star | 7.5 | 7.4 | 8.8 | 7.6 | 8.3 | 5.4 | £380 | Amazon |
| Nanit Breathing WearBest for Nanit owners | 6.8 | 6.8 | 5.0 | 9.0 | 7.4 | 6.5 | £20 | Amazon |
| Sense-U Smart Baby Monitor 3 | 6.3 | 6.4 | 4.5 | 7.2 | 6.6 | 6.8 | £90 | Amazon |
| Snuza Pico 2 | 5.9 | 6.0 | 5.0 | 7.4 | 6.0 | 5.6 | £120 | Amazon |
Before you buy
This is the single most important thing to check. A certified medical device carries a CE or UKCA mark covering its medical claims and a stated intended use, and higher-risk classes (IIa and IIb) must be assessed by an independent body rather than simply self-declared by the maker. In the UK the MHRA regulates medical devices, and The Lullaby Trust recommends that if you use a monitor, it's one classed as a medical device: look for 'MD' on the packaging or product information.
In this roundup, the Owlet Dream Sock (including the sock in the Dream Duo) and the Snuza Hero MD are certified medical devices. The Snuza Pico 2, Sense-U and Nanit Breathing Wear are not, and don't claim to be. That doesn't make them dangerous, but it does mean nobody independent has checked that they detect what they say they detect.
One wrinkle: Owlet's UK marketing calls the Dream Sock 'MHRA Medically Approved'. Strictly, its UKCA certificate was granted by a UK approved body, with the MHRA as the regulator. It's properly certified either way.
Clip-on movement monitors like the Snuza Hero MD do one thing: they feel for the rise and fall of your baby's tummy and sound an alarm if it stops for around 20 seconds. Smart socks like the Owlet use pulse oximetry, the same principle as the finger clip your GP might use, to read heart rate and blood oxygen, and alert you if either falls outside set limits.
More data isn't automatically better. The Lullaby Trust leaves heart rate and oxygen monitors out of its CONI programme because it found that detail, which can be hard to interpret without medical training, can add to anxiety rather than offer peace of mind. If you know you're a checker, a simple movement alarm may suit you better.
It sounds obvious, but it's the question most people forget. The Snuza Hero MD alarms on your baby, which is fine when you're room-sharing (as safer sleep advice recommends for the first six months) but no use for a nap upstairs while you're in the kitchen, unless you pair it with an audio monitor.
The Owlet sends alerts to a base station and your phone, and because the sock talks to the base station over Bluetooth, it keeps alerting if your Wi-Fi drops. Owlet recommends keeping the base station within 9 metres of the sock, and some UK testers found that tight in a real house. Nanit's alerts go to its camera and app, while the Snuza Pico 2's app relies on Bluetooth, so your phone needs to be nearby.
Clip-on monitors work best on young babies who stay put. Once your baby starts rolling, the sensor can shift off the tummy and false alarms become more likely, a point reviewers of the Snuza Hero make consistently. Smart socks carry on working through rolling, and the Owlet is designed for use up to 18 months. Nanit's Breathing Band runs to 24 months, and the Pico 2 claims up to six years, though by then it's a sleep tracker rather than anything safety-critical.
It's also worth knowing that The Lullaby Trust's guidance for CONI families is that, for most babies, monitoring can stop by around six months, because the risk of sudden infant death falls with age.
The sticker price isn't the whole story. The Owlet needs a daily charge but no subscription; Owlet360 is an optional extra. The Snuza Hero MD runs on a CR2 battery that lasts up to about six months, and Mumsnet's review puts replacements at under £10. Nanit's Breathing Wear is cheap on its own but only works with a Nanit Pro camera, typically £249 to £299, and some of Nanit's sleep analytics need a paid plan. Budget for the whole setup, not just the bit your baby wears.
No. There's no research showing that any baby monitor helps prevent sudden infant death syndrome, and The Lullaby Trust is clear on this. What reduces risk is safer sleep: baby on their back, in a clear, flat, separate sleep space, in a smoke-free home, not overheated, and in the same room as you for the first six months. A monitor can give you peace of mind, but it should sit on top of that advice, never replace it.
Yes. Owlet received UKCA certification for the Dream Sock in 2024 from a UK approved body, and it's also CE marked, as an infant vital sign monitor that measures blood oxygen and pulse rate. It's intended for healthy babies from birth to 18 months (2.5kg to 13.6kg), and Owlet says it isn't intended for babies already diagnosed with chronic heart or breathing conditions. Its alerts are designed to prompt you to check on your baby, not to diagnose anything, so it doesn't replace your GP, health visitor or NHS 111.
Be careful. Amazon UK lists a growing number of cheaper socks that track heart rate and sleep, often from brands you won't have heard of. Unless the listing clearly shows medical-device certification (a CE or UKCA mark covering its medical claims), treat it as a wellness gadget whose readings haven't been independently assessed. Unreliable alerts, false or missed, can do more harm to your peace of mind than good. If you want a sock, the Owlet is the certified option; if you want something cheaper, a certified movement monitor like the Snuza Hero MD is the better bet.
Not reliably. The Lullaby Trust warns that movement monitors won't work reliably when you co-sleep, because they can pick up your own breathing and movement, and Snuza says the Hero MD isn't suitable for co-sleeping. In a car, buggy or pram, the motion around your baby can be mistaken for them moving, which could give you false reassurance. Use them as the makers intend, for a baby asleep in their own cot or Moses basket.
Talk to your neonatal team, GP or health visitor first. If your baby needs medical monitoring at home, that's something your hospital team would arrange, and a consumer wearable isn't a substitute. The Owlet Dream Sock, for example, is intended for healthy infants and not for babies diagnosed with chronic heart or breathing conditions. If you've previously lost a baby, ask your health visitor about The Lullaby Trust's Care of Next Infant (CONI) programme, which offers support and, where appropriate, a movement monitor.
Have a plan before you need it, and share it with anyone who looks after your baby. The Lullaby Trust's advice is to switch off the alarm and check your baby: look for movement of their chest or tummy, put your cheek near their face to feel or hear breathing, and try to rouse them by talking, blowing on or touching their face, or tickling the soles of their feet. Never shake your baby. If they don't respond, call 999 straight away and put the phone on speaker. If they respond but you're worried, contact NHS 111, your midwife, GP or health visitor. A baby first aid course is well worth doing.