What should baby wear under a sleeping bag at nursery?

Why do home layers often not match the baby room?

A nursery sleep room is usually held near the 16–20°C range that DfE and the Lullaby Trust publish for babies aged 12 months and under. Homes are often cooler at night or warmer in the afternoon. The same 2.5 tog bag with a vest and a sleepsuit can be too much once the heating is on all day.

NDNA’s July 2026 safer-sleep note tells settings to work with parents before using sleep bags and to consider room temperature, the child’s clothing and the tog rating together. That three-way agreement is the nursery version of “what should they wear”, not a printed MayTally chart.

Bristol Childcare’s published policy lists clothes that stay off for sleep: hoodies, jumpers, hats, thick trousers or jeans, dribble bibs and amber teething necklaces. In very hot weather that policy dresses babies in a nappy only. Ask your setting for its own clothing list.

What tog ranges does the NHS list?

NHS Best Start in Life says sleeping bags are usually given a tog rating, that clothing can be adjusted for the room and the tog, and that there should be no other bedding. It then lists commercial sleeping-bag togs — typical shop ranges, not a vest-by-vest outfit table:

If the manufacturer’s label on your bag shows different room bands, follow that label. NHS is describing typical commercial ranges; the sewn-in guide is the one staff can check on the garment.

Why will the Lullaby Trust not give a vest-and-sleepsuit chart?

Families often ask the Lullaby Trust for a table that matches room temperature to clothing layers and tog. On dress your baby for sleep it says it cannot publish that specific advice, because:

• Every product uses different materials, so trapped heat differs.
• Heat trapped between layers (for example a blanket and a baby grow) changes the warmth a great deal.
• Every baby is different, so the 16–20°C room figure is a guide only.

MayTally does not fill that gap with an invented nursery outfit table. The workable list is still nappy, vest or short-sleeve bodysuit, sleepsuit or baby grow, plus the tog on the bag — then a chest check after the child is down.

How do I agree layers with nursery staff?

1. 1
   Ask for the room temperature they aim for DfE and the Lullaby Trust publish 16–20°C for babies. Ask where the thermometer sits and what staff do on a hot afternoon when the room rises above that band.
2. 2
   Show the bag label Weight range (most bags are sized by weight, not age), tog, and any manufacturer clothing note. Bristol’s policy records a bag check as a moment on the child’s record.
3. 3
   Name the daytime outfit in three words Examples staff can follow: nappy only; nappy and vest; nappy, vest and sleepsuit. Do not send a hoodie or hat for indoor sleep.
4. 4
   Write the chest-check rule on the form Lullaby Trust and DfE: feel the chest or the back of the neck. Hands and feet are usually cooler. If the skin is clammy, remove a layer. If the chest feels cold, add a clothing layer or a higher tog — not a blanket on the bag.

The Sussex NHS nursery handbook adds that sleep bags must be the correct size and tog for the baby’s age and the room, and that children should be dressed in comfortable clothing that supports temperature regulation. Hair grips, clips and jewellery that could tangle are removed under that policy.

What changes in hot weather or if my baby is unwell?

Lullaby Trust: in really hot weather it is fine for a baby to sleep in a short-sleeve vest or even just a nappy. Hats come off indoors because babies lose heat through the head. Weighted sleeping bags are not advised for babies under one year on that page.

If a baby has a fever, the same page says dress them for the room and not to wrap an unwell baby more than usual. Clinical questions go to a GP or 111 — MayTally does not give medical advice.

In shortIn short: agree nappy, vest or sleepsuit, and tog with the setting. Use the NHS commercial tog bands as a shopper’s starting point and the manufacturer label as the garment rule. The Lullaby Trust will not publish a clothing chart; a chest or neck check is the check those pages keep.