Heating On, Baby Asleep: A Room Temperature and TOG Guide for Autumn Nights

Warmer is safer. It is one of the most stubborn bits of baby folklore going, and it gets passed down with love from grandparents, neighbours and that one auntie who swears by a woolly hat at bedtime.

Here is the truth: babies are far more likely to get too hot than too cold. Overheating is a known risk factor for sudden infant death, which is why the safe sleep advice is so keen on keeping things cool and simple.

And right now, as the radiators clank back into life for the first time since spring, it is the perfect moment to rethink the nursery. 🍂

So let's work through it the easy way, from the outside in. The room, the bag, the layers, then the quick checks that tell you whether you have got it right.

Layer One: The Room

The sweet spot for a baby's room is 16 to 20°C. That feels a little chilly to most grown-ups, and that is exactly the point.

Autumn is tricky because the temperature swings so much. A sunny October afternoon can leave a south-facing room toasty, then the heating kicks in at teatime, then everything plummets by 4am.

A few things that genuinely help:

• Keep the cot away from radiators, heaters and sunny windows. Even a metre makes a difference.
• Check your heating timer. If it blasts on at 5am, the nursery might hit 23°C before anyone is awake.
• Turn the nursery radiator down rather than off, so the room stays steady instead of swinging.
• No fan heaters or electric blankets near the cot, and no hot water bottles in it.

The trouble is, guessing room temperature by feel is hopeless. Your sense of "warm" depends on whether you have just climbed the stairs with a laundry basket.

That is where a little room thermometer earns its keep. Pop it at roughly cot height, away from the radiator, and you will know the actual number instead of the vibe.

A colour-changing one is handy at night, because you can read it at a glance without switching the big light on and waking everybody up.

Layer Two: The Sleeping Bag

A baby sleeping bag is the easiest way to keep things safe and cosy. No loose covers, no kicking off a blanket, no worrying about it creeping up over their face.

The key thing is the TOG, which is simply a measure of how warm a fabric is. Higher TOG means warmer.

As a rough rule of thumb:

• 2.5 TOG is the go-to for a typical autumn and winter nursery, sitting somewhere around 16 to 20°C.
• 1.0 to 1.5 TOG suits warmer rooms, roughly 20 to 24°C, or a flat that holds heat.
• 0.5 TOG is for properly hot summer nights.

Every brand has its own chart, so always check the label for the exact pairing of room temperature, TOG and what to wear underneath.

For most UK homes from now until spring, a 2.5 TOG bag is the workhorse.

But here is a tip from the trenches: get a lighter one too. Central heating makes room temperatures wildly unpredictable, and a 1.5 TOG bag gives you somewhere to go on the nights the nursery runs warm.

When you are buying, look for a bag that fits well around the neck and arms so your baby cannot slip down inside it. And skip anything with a hood, because babies lose heat through their heads and need to keep them uncovered for sleep.

Layer Three: What Goes Underneath

This is where most of us overdo it. A thick sleepsuit, plus a vest, plus a 2.5 TOG bag, plus a blanket on top "just in case"? That is a lot of insulation for a tiny person.

The usual combinations look something like this:

• Cooler room (16 to 18°C): vest plus long-sleeved sleepsuit, inside a 2.5 TOG bag.
• Middling room (18 to 20°C): long-sleeved sleepsuit or vest, inside a 2.5 TOG bag.
• Warmer room (20°C and up): a vest or light sleepsuit, inside a lighter TOG bag.

Again, check the chart on your specific bag, as each brand calibrates slightly differently.

Breathable cotton sleepsuits are your best friend here. They layer nicely, wash well and do not trap heat the way fleecy fabrics can. A two-way zip is a quiet hero too, because you can unzip from the bottom for a nappy change without letting all the warmth out.

And the hats? Lovely for a crisp walk in the park. Never for sleep indoors. Babies cool down through their heads, so bedtime means bare heads, always.

Layer Four: The Quick Checks

Once your setup is sorted, a few simple habits let you check it is working.

Feel the chest or the back of the neck. This is the reliable spot. Hands and feet often feel cool, and that is completely normal, so do not add layers based on chilly fingers.

Look for signs of being too hot. A sweaty neck, damp hair, or a flushed, hot tummy means it is time to remove a layer or swap to a lighter bag.

Come in from the cold, take off the layers. If your baby has fallen asleep in the pram or the car seat on the way home, take off their coat, hat and any blankets as soon as you are indoors, even if it means a little wriggle.

Re-check when the weather changes. The first truly frosty week, a sudden mild spell, a new heating schedule. Each one is a good prompt to glance at the thermometer again.

If your baby feels unusually hot or cold, seems unwell, or you just have that niggly feeling something is not right, trust it. Speak to your GP or health visitor, or call NHS 111 for advice. You know your baby best. 💛

A Quick Word on Blankets

Sleeping bags are the simplest option, but if you do use blankets, keep them thin and cellular. Place your baby feet to foot of the cot, and tuck the blanket in firmly no higher than their shoulders.

No duvets, quilts, pillows or cot bumpers for babies under one. They are cosy for us, but not safe for them.

Put It on the Wishlist

Here is the nice part. None of this is expensive, and every piece of it makes a thoughtful gift.

Sleeping bags in two TOGs, a couple of breathable sleepsuits and a simple room thermometer are exactly the sort of practical bits that friends and family love to tick off. Add them to your BubsNest wishlist and let the people who love you help you get set for the colder months.

Cool room, the right bag, sensible layers and a quick hand on the chest. That is honestly all it takes. Sleep well, little one. 🌙