What Should My Baby Wear to Sleep at 18°C? (UK Guide)

At 18°C, many babies sleep best with a warmer TOG and simple base layers. Below are clear outfit ideas and a quick checklist you can use tonight.

Quick note: Every baby is different. Use this guide as a starting point and check your baby’s chest or the back of their neck (not hands and feet) to judge comfort.

Quick answer: what to dress baby in at 18°C

18°C usually sits within the range where many families use a 2.5 TOG sleeping bag or sleeping suit.

Most common option for 18°C

·      2.5 TOG sleeping bag

·      Vest + sleepsuit underneath

If your baby runs warmer

·      2.5 TOG sleeping bag

·      Vest only (lighter base layer)

Shop 2.5 TOG Collection- Read our TOG Guide

Bedtime checklist for an 18°C room

·      Room thermometer reading near cot: 18°C

·      Choose: 2.5 TOG

·      Base layers: vest + sleepsuit (adjust lighter/heavier)

·      Comfort check after settling: chest/back of neck

How to avoid overheating (even at 18°C)

Overheating can still happen at 18°C if layers are too thick. If your baby feels hot, clammy, or sweaty on their chest or back of neck, remove a layer.

What about toddlers at 18°C?

If your toddler: - stands up a lot, - moves around frequently, or - kicks covers off,

a 2.5 TOG sleeping suit can be a practical option for warmth and movement.

Shop 2.5 TOG Sleeping Suits

FAQs

What TOG do I need for 18°C? 18°C usually sits within the 2.5 TOG range.

How do I check if baby is too hot? Feel your baby’s chest/tummy or the back of their neck. Hands and feet aren’t a reliable guide.

What room temperature is recommended in the UK? Many UK families aim for a comfortable range around 16–20°C.

For 18°C nights

Shop 2.5 TOG And bookmark our TOG Guide for quick checks