Can a 15 month old sleep in a sleeping bag?
Short answer: Yes. Choose the size for your child's weight and height, and a tog for your room temperature.
Babies change fast, so the answer depends on your child's age, weight and development, and on your product's instructions.
What the guidance says
- A well-fitted baby sleeping bag is an alternative to blankets. Most makers base suitability on weight (usually around 4kg) rather than age, so check the label.
- 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.
- Keep the room between about 16C and 20C and check it with a room thermometer.
Shop at Baby Kingdom
- Muslin Swaddle Blanket - Eucalyptus
- 1.0 Tog Baby Sleep Bag 6-18 Months
- Sleeping Bag, New Born to Six Months - Berry
- Sleeping Bag, New Born to Six Months - Ocean Stripe
Check each product page for its exact dimensions, mattress size, age and weight limits and safety standards.
More advice
Can a 5 month old sleep with a blanket?Baby sleeping bag buying checklistCan a 10 month old sleep with a blanket?Safe swaddling: what UK guidance saysGuide to swaddles & blankets: what to look forSleeping bag or blankets: which suits your baby?All baby bedding and sleeping bags advice →
Sources
- The Lullaby Trust: Baby mattresses and bedding (accessed 2026-10-21)
- NHS: Sudden infant death syndrome (SIDS) (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.