When should I buy a baby sleeping bag?
Short answer: Buy in time for when you will first use it: once your baby meets the maker's minimum weight (often around 4kg), through the cot years. For newborn essentials, many parents order in the second trimester to allow for delivery and assembly.
- 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
- 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.
- Avoid weighted swaddles, weighted blankets, weighted sleeping bags and sheepskins.
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
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Check each product page for its exact dimensions, mattress size, age and weight limits and safety standards.
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Sources
- 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.