What TOG Do I Need? Baby Sleepwear by Room Temperature (UK Chart)

Choosing the right TOG can make bedtime feel much simpler—especially when temperatures change week to week. In the UK, many parents aim for a comfortable sleep space around 16–20°C and focus on avoiding overheating.

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.

What does TOG mean?

TOG is a warmth rating for sleep bags and sleep suits. Higher TOG = warmer. The right TOG depends on your room temperature and what your baby wears underneath.

UK TOG chart by room temperature (quick guide)

Use this simple chart as a starting point:

16–20°C: Usually 2.5 TOG Typical under-layers: short/long-sleeve vest + sleepsuit

20–24°C: Usually 1.0 TOG Typical under-layers: vest only, or a light sleepsuit (depending on baby)

24–27°C: Usually 0.5 TOG Typical under-layers: nappy + light vest (often enough)

 

Shop 2.5 TOG - Shop 1.0 TOG - Read our TOG Guide

How to choose the right TOG (in 60 seconds)

1.        Check the room temperature near the cot (a simple room thermometer helps).

2.        Start with the chart above and pick your TOG.

3.        Choose base layers (vest/sleepsuit) based on how warm your baby usually runs.

4.        Do the comfort check: feel chest/back of neck. If clammy or sweaty, remove a layer.

Avoid overheating: the most common mistake

It’s normal to worry about baby being cold, but it’s important not to over-layer. If your baby feels hot, sweaty, or clammy on their chest or back of neck, reduce layers or switch to a lower TOG.

Sleeping bag vs sleeping suit: which should you pick?

Sleeping bags are great for babies and toddlers who stay lying down most of the night.

Sleeping suits can be helpful for toddlers who stand up, move a lot, or dislike the “restricted legs” feeling.

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FAQs

What temperature should my baby’s room be? Many UK parents aim for a comfortable range around 16–20°C.

How do I check if my baby is too hot at night? Check your baby’s chest/tummy or the back of their neck. Hands and feet can feel cooler naturally.

Can I use blankets instead of a sleeping bag? If you use blankets, keep them securely tucked so they can’t ride up over baby’s face, and follow safer sleep guidance.

What TOG is best for 18°C? 18°C usually sits within the 2.5 TOG range.

Want to make this even easier?

Start here: Read our TOG Guide

Then shop: 2.5 TOG Collection; 1.0 TOG Collection;