Can a 4 month old sleep with a blanket?
Short answer: Yes, if it is lightweight, firmly tucked no higher than the shoulders, with your baby feet to foot. One doubled blanket counts as two. The 12-month point is about 8 months away.
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
- If you use sheets and blankets, tuck them in firmly no higher than shoulder height. One blanket doubled over counts as two.
- Always place your baby on their back to sleep, in the feet-to-foot position (feet at the bottom of the cot, Moses basket or pram).
- Avoid weighted swaddles, weighted blankets, weighted sleeping bags and sheepskins.
Shop at Baby Kingdom
- Muslin Swaddle Blanket - Ocean
- Muslin Swaddle Blanket - Berry Stripe
- Large Muslin Square Swaddles 3pk
- Muslin Swaddle Blanket - 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 in a sleeping bag?Sleeping bag or blankets: which suits your baby?Can I swaddle a 4 month old?Can a 10 month old sleep with a blanket?Guide to cot bedding sets: what to look forKeeping your baby cool in a summer heatwaveAll 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.