What tog sleeping bag does my baby need?

The tog table, in practice

• 16–20°C (a typical UK nursery most of the year): 2.5 tog, with a vest and sleepsuit underneath at the cooler end, just a sleepsuit at the warmer end.
• 20–24°C: 1.0–1.5 tog, vest or sleepsuit underneath depending on the exact temperature.
• 24°C+ (heatwaves): 0.5 tog or just a vest — and prioritise cooling the room.

A room thermometer takes the guesswork out; many baby monitors include one.

Why fit matters as much as tog

The safety point of a sleeping bag is that it can't ride over the face — but only if the neck hole is right. It should be snug enough that baby can't slip down inside, with the correct armholes for their size, no hood, and sized by weight/height per the brand's chart rather than age alone.

Checking baby's temperature

Feel the chest or back of the neck — warm is right, sweaty means too hot. Cold hands are normal and not a reliable signal. Overheating matters more than mild cold for safer sleep, so when in doubt, go a layer lighter. Our sleeping bag guide compares togs, fabrics and fits across the trusted brands.