Dressing Your Baby for Safe Sleep in Winter: What Parents Need to Know

The cold weather is most definitely here in the UK! With the cost of living high (along with energy prices) it is going to be a difficult time for many families. You might have to make difficult decisions between heating or eating which is why the Lullaby Trust published guidance last year with new winter guidance.

t’s natural to want to keep your baby warm and cosy — but research shows that overheating is a key risk factor for SIDS (Sudden Infant Death Syndrome).So, while comfort is important, it’s actually safer for babies to be a little on the cooler side rather than too warm.

Let’s look at how to dress your baby for safe, comfortable, and restful sleep during the winter months.

Why Overheating Is a Risk

Babies are still learning to regulate their body temperature. When they get too warm during sleep, it can increase the risk of SIDS and lead to unsettled sleep.

A good rule of thumb: Your baby should feel comfortably warm — not hot or sweaty. Their chest or back should feel warm to the touch, but their hands and feet can feel a little cooler (that’s completely normal).

How to Dress Your Baby for Sleep in Winter (Safely)

The safest sleep environment for your baby is:

• In their own sleep space (cot, crib, or Moses basket)

• On their back to sleep

• In a clear sleep space — no loose bedding, toys, or pillows

When it comes to dressing, here’s what to consider 👇

 If You’re Using a Baby Sleeping Bag

Baby sleeping bags (or sleep sacks) are a great option for keeping your baby warm without the risks of loose blankets.

Follow these safe sleep tips:

✅ Choose the right tog rating (Thermal Overall Grade) for the room temperature — lower togs for warmer rooms, higher togs for colder rooms.

✅ Check the manufacturer’s guidelines for recommended room temperatures.

✅ If your baby feels cool, add a light layer of clothing underneath the sleeping bag instead of adding blankets.

🚫 Never add extra blankets on top of a sleeping bag — this increases the risk of overheating.

💡 Tip: A long-sleeve cotton sleepsuit or bodysuit under the sleep sack usually works well in winter.

If You’re Using Sheets or Blankets

Some families prefer traditional sheets and blankets — which is absolutely fine when used safely.

Here’s how to do it safely in winter:

✅ Use several light layers rather than one thick or padded blanket.

✅ Tuck bedding firmly under the mattress and ensure it comes no higher than your baby’s shoulders.

✅ Keep your baby’s head and face uncovered during sleep.

🚫 Avoid duvets, quilts, or pillows for babies under 12 months.

✅ If your baby seems cold, add an extra light blanket or layer of clothing — not a heavy one.

Room Temperature and TOG Guide

The ideal room temperature for baby sleep is around 16–20°C (60–68°F).Use a baby room thermometer if possible to help guide your choices.

As a general guide:

• 20–22°C: 1.0 tog sleeping bag + long-sleeve vest

• 18–20°C: 2.5 tog sleeping bag + sleepsuit

• 16–18°C: 3.5 tog sleeping bag + long-sleeve vest and sleepsuit

Always check your baby, not just the room — every baby is different, and what feels warm enough for one may be too hot for another.

If you are bed-sharing in the winter months:

• The Lullaby Trust recommends a baby sleeping bag when bed-sharing rather than loose bedding. 

• Keep adult bedding at your waist height and add an extra layer of clothing if you are cold.

• The warmth generated by an adult in the same bed as a baby may create a warmer environment, so adjust bedding and/or clothing for your baby accordingly.

Final Thoughts on Winter Baby Sleep Safety

When it comes to dressing your baby for sleep in winter, the key is balance — warm enough for comfort, but cool enough for safety.

Trust your instincts and check your baby’s temperature regularly. If they’re sweaty, flushed, or have damp hair, they’re likely too warm.

A cooler, layered approach is always safer than piling on heavy blankets.

If you’d like more guidance on safe baby sleep, creating sleep rhythms which work for your little one, or creating calm bedtime and naptime routines explore my gentle sleep support packages or online baby sleep courses — designed to help your family rest better, all year round.