The report card
- Soothing & responsiveness30% of score9.4
Five levels of womb-like motion and sound that step up automatically when it detects fussing; the benchmark everything else is measured against.
- Safe sleep design25% of score6.8
Flat, firm mattress and mesh sides, but the clip-in sack sits awkwardly with UK guidance, and the UK pages cite US approvals rather than BS EN 1130.
- Everyday use15% of score8.0
App remote control, sleep logging and a lock that stops motion without the clips engaged, but it weighs 17.4kg.
- Value & running costs20% of score4.2
Very expensive to buy; renting helps, but Premium features cost extra if you rent or buy second-hand.
- Lifespan & flexibility10% of score4.8
Designed for birth to six months, and you stop once your baby can roll.
The full review
The SNOO, designed by US paediatrician Dr Harvey Karp, is the bassinet that made smart cribs a category. It rocks and plays white noise all night at a gentle baseline and, when it detects fussing, steps up through four further levels of motion and sound, a bit like an experienced carer might. Your baby sleeps in a SNOO Sack whose wings clip onto the bassinet, and the motion won't start unless the clips are engaged.
On paper it's the most refined soother here, and parents love it: it averages 4.3 out of 5 from more than 900 reviews on Happiest Baby's UK site, and MadeForMums' testers, reviewing it back in 2021, praised how it settled babies and kept them on their backs, while calling it prohibitively expensive. The app lets you control it remotely and logs sleep, and a weaning mode helps you move to a normal cot by keeping the sound on but only rocking when your baby cries.
The UK safety picture is more nuanced than the marketing. In the US the SNOO is authorised by the FDA as a medical device for home use, and Happiest Baby markets its clips as keeping babies on their backs. The Lullaby Trust's general advice, though, is not to use any sleep surface that straps or holds a baby in one position, and Happiest Baby's UK pages cite US approvals rather than BS EN 1130. In June 2026 the FDA also issued Happiest Baby a warning letter over unauthorised extra-small and extra-large sack sizes, hospital bundles, and complaints about dirty refurbished units in the US. The SNOO itself wasn't recalled, and the FDA reported no injuries, but it's worth knowing.
Then there's the cost. It's £1,395 delivered, with a 30-day trial, three sacks, a sheet and nine months of free Premium app access for new purchases from Happiest Baby or an authorised partner. Happiest Baby's UK site doesn't list a rental scheme of its own, but UK rental firms such as Baboodle charge around £70 a month, and renters and second-hand buyers pay £14.99 a month for Premium features such as weaning mode.
Pros and cons
What I like
- The most refined responsive rocking and white noise on sale
- Motion won't start unless the sack is clipped in
- Excellent app with remote control and sleep logging
- 30-day trial, and you can rent one in the UK
What I don't
- £1,395 to buy
- Premium features such as weaning mode cost £14.99 a month once any free period ends
- Clip-in sack sits awkwardly with Lullaby Trust advice on products that hold babies in position
- UK pages cite US approvals rather than BS EN 1130
Key specs
- Soothing
- 5 levels of motion and sound; responds automatically to fussing
- Swaddle
- SNOO Sack clips to built-in safety clips (3 sizes included)
- Age
- Birth to 6 months, for babies who can't yet roll over
- Dimensions
- L90.8 x W48.3 x H81.9cm (with legs)
- Weight
- 17.4kg
- Power
- Mains; UK and EU adaptors included
- App
- Free tier; Premium free for 9 months with a new purchase, then £14.99 a month
- Trial and warranty
- 30-day trial; 1-year limited warranty
Head-to-heads
What I read
This is a research-led review. These are the main sources behind the scores, alongside patterns in verified owner reviews. How I review.