How long can you use a cot?
Short answer: Typically from birth, once you are ready to move on from a Moses basket or bedside crib, until your child is ready for a bed. Always go by the age, weight and development limits in the instructions for your model.
Product limits vary, so check the instructions and the product page.
- Check the internal size and buy a mattress that fits with no gaps.
- Adjustable base heights let you lower the mattress as your baby learns to sit and stand.
- Teething rails protect the top rails from little teeth.
What the guidance says
- Use a firm, flat, waterproof mattress in good condition, with no raised or cushioned edges, that fits the cot or Moses basket with no gaps.
- Keep the cot clear: no pillows, duvets, cot bumpers, loose blankets, soft toys, pods, nests, wedges or anything to keep your baby in place.
- Place the cot away from radiators, direct sunlight and blind cords.
- Cots and travel cots: look for BS EN 716-1:2017.
- Mattresses: look for BS 7177:2008+A1:2011, and BS EN 16890:2017+A1:2021 for cot, travel cot and crib mattresses.
Related questions
What is a cot?
A framed baby bed with fixed sides, usually taking a 120 x 60cm mattress.
Shop at Baby Kingdom
- Bantam Space Saver Cot - White
- Obaby Stamford Space Saver Cot in Warm Grey
- Bantam Cot - White
- Bantam Space Saver Cot - Warm Grey
Check each product page for its exact dimensions, mattress size, age and weight limits and safety standards.
More advice
Can an 8 month old still sleep in a bedside crib?Baby product standards quizWhen should I buy a cot?What bedding goes in a cot bed?Summer sleep safety quizYour 6 month's sleep space: a safe-sleep guideAll safe sleep and sleep spaces 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.