When can a baby have a duvet in the cot in the UK?

What is the official UK age ceiling for a duvet?

NHS baby and toddler safety is the plain sentence retailers skip: do not use pillows or duvets with babies under the age of 1, as they can suffocate if their face gets smothered and they will not be able to push the duvet away. NHS 'what you will need' adds that duvets can also make a baby too hot, and points to sheets and layers of blankets tucked in firmly below shoulder level, or a baby sleeping bag.

The Lullaby Trust mattresses page (reviewed 1 February 2025) says soft or bulky bedding is not recommended for babies under 12 months because of overheating and the head being covered. Its product guide (February 2025) states that duvets, cot quilts and pillows have been shown to increase the risk of SIDS and are not recommended for babies under one year. Those are the same 12-month / one-year ceiling, written two ways.

MayTally is repeating that ceiling, not adding a later one. Some shop pages treat the first birthday as a switch-on date for a toddler duvet. Official pages give a 'not under 1 / not under 12 months' line. They do not publish an 18-month duvet rule.

Why do those pages keep duvets out before then?

Two mechanisms sit in the official wording, and both apply in a cot as much as in a Moses basket.

• Face covering. NHS: a baby cannot push the duvet away. The Lullaby Trust clear-cot list exists so nothing can cover the mouth and nose.
• Heat. NHS: duvets can make a baby too hot. The Trust's overview asks you to avoid the baby getting too hot and to aim for a room around 16–20°C. Its bedding page notes that bulky bedding has been shown to increase the risk of SIDS by three times.
• The same list as quilts and pillows. Official pages group duvets with quilts, pillows and thick heavy bedding. A 'cot quilt' in a gift set is not a different product under that wording.

NHS SIDS advice puts duvets on the same keep-clear line as pillows, cot bumpers, loose blankets and soft toys for the whole of the first year — SIDS can affect babies up to 12 months old on that page.

What can go in the cot instead of a duvet?

Official pages describe two everyday options. They are not a tog-buying guide.

If the room is cool, official pages point to an extra lightweight layer or a warmer sleeping bag, not to bringing the duvet forward. Check the chest or back of the neck; the Lullaby Trust and Which? both say hands and feet are a poor guide.

Do quilts and pillows follow the same line?

Yes. NHS baby-and-toddler safety names pillows or duvets together under the age of 1. The Lullaby Trust names quilts, pillows and duvets together as soft or bulky bedding, and repeats pillows-and-duvets on the under-12-months sleeping-products page.

Which? (20 April 2023) discusses pillows at the cot-to-toddler-bed move, which it puts at around 18 months to three years. That is a pillow-and-bed article, not an official duvet age. Do not read it as an 18-month duvet rule. The NHS / Lullaby Trust ceiling for a duvet in a cot stays at one year / 12 months.

What changes after 12 months?

The official 'do not use under 1 / not listed under 12 months' line no longer applies in those words. Official pages do not then publish a how-to for the first duvet: they do not set tog, tog plus vest, or a start-on-the-birthday ritual.

What they still want is a clear, flat sleep space and a baby who cannot wriggle under a loose cover. Many families keep a sleeping bag or a tucked blanket well after the first birthday because the child is still in a cot. That is a household choice, not a second official ban.

1. 1
   Confirm the child is past the official ceiling NHS: under the age of 1. Lullaby Trust: under 12 months / under one year. Count from the due date for a premature baby if you are still following first-year safer-sleep advice on the Trust's overview.
2. 2
   Look at the sleep space, not the shop aisle A toddler still in a cot can kick a duvet over their face. A well-fitted sleeping bag or a tucked blanket still matches how official pages describe bedding.
3. 3
   If you do introduce a duvet, keep the rest of the cot clear Bumpers, pillows, loose toys and a second quilt are still on the first-year keep-out lists. Adding a duvet is not a reason to refill the cot.

In shortOfficial UK wording is a ceiling, not a countdown: no duvet or quilt under 1 / under 12 months. Until then, a tucked lightweight blanket or a well-fitted sleeping bag is what NHS and the Lullaby Trust describe. There is no official 18-month duvet date.