Can my baby sleep in just a vest and sleepsuit?
Short answer: That depends on the room temperature. Aim for 16C to 20C, dress for the room, and check your baby's chest or neck for warmth.
Here is the detail behind that answer, taken from current UK guidance from the NHS and the Lullaby Trust.
Things to check
- Choose the right size for your baby's weight so the neck and arm holes are snug and they cannot slip down inside.
- Pick a tog for your room temperature and adjust the clothing underneath.
- Avoid weighted sleeping bags, and do not use a hood or extra blankets on top.
What the guidance says
- Keep the room between about 16C and 20C and check it with a room thermometer.
- Check your baby's temperature by feeling their chest or the back of their neck. Cool hands and feet are normal.
- The Lullaby Trust does not publish a tog chart, because fabrics, layers and babies differ. Use the room temperature as a guide and check your baby's chest or neck.
Related questions
What is a baby sleeping bag?
A wearable bag that replaces loose blankets, so your baby cannot wriggle under covers.
Shop at Baby Kingdom
- Sleeping Bag, New Born to Six Months - Ocean
- Baby Sleep Bag 6-18 Months
- 1.0 Tog Baby Sleep Bag 0-6 Months
- Baby Sleep Bag 0-6 Months
Check each product page for its exact dimensions, mattress size, age and weight limits and safety standards.
More advice
What cot bedding sets does Baby Kingdom sell?Is 22C OK for a baby's room?Can a 7 month old sleep in a sleeping bag?Cot sheet buying checklistCot sheets buying guide for UK parentsGuide to baby bedding: what to look forAll baby bedding and sleeping bags advice →
Sources
- NHS: Sudden infant death syndrome (SIDS) (accessed 2026-10-21)
- The Lullaby Trust: Baby mattresses and bedding (accessed 2026-10-21)
General information only, not medical advice. Always follow your product's instructions. If you are worried about your baby, contact your GP, health visitor or 111. In an emergency, call 999.