September 01, 2025

Transitioning Your Baby’s Sleepwear from Winter to Spring

As the chilly winter nights fade and the first signs of spring begin to bloom, many parents wonder: How do I dress my baby for sleep when the weather is all over the place?

One night it feels like winter is still hanging around, and the next it’s suddenly warm enough to throw open the windows. Dressing your little one comfortably, and safely, through this change can feel tricky, but don’t worry. We’re here to guide you through TOG ratings, layering tips, and what works best for springtime sleep.

What is a TOG rating?

TOG stands for Thermal Overall Grade - a handy way of measuring how warm a baby’s sleeping bag is. The higher the TOG, the warmer it will keep your baby.

Here’s a quick breakdown:

0.2–0.5 TOG → Lightweight for hot summer nights (24°C+)
1.0 TOG → Great for warmer rooms (21–24°C)
2.5 TOG → Perfect for transitional seasons like spring & autumn (16–20°C)
3.5 TOG → Snug and cosy for the coldest winter nights (under 16°C)

Why Spring Can Be Tricky

Spring nights can be unpredictable. One evening feels balmy, the next is crisp and cool. This is where 2.5 TOG sleeping bags really shine. They’re warm enough to handle a cool night but still breathable when mornings start to warm up.

Think of them as the “all-rounder” of baby sleepwear, ideal for that in-between season.

Dressing Your Baby in Spring: A Simple Guide

A good rule of thumb is to dress your baby in one more layer than you’d wear yourself. But here’s a more detailed guide for those in-between temps:

Chilly Spring Nights (Room 15–18°C):
2.5 TOG sleeping bag + long-sleeve romper or layers underneath.
Milder nights (Room 18–21°C):
2.5 TOG sleeping bag + short-sleeve romper.
Warm Evenings (Room 21–24°C):
Switch to a 1.0 TOG sleeping bag + lightweight layers.

A simple tip: do the neck check, if your baby’s neck feels warm (not sweaty, not cold), they’re dressed just right.

Always check the back of your baby’s neck or chest, not their hands or feet, to make sure they’re comfortably warm, not sweaty or cold.

Don't Over Layer

Making sure your baby’s sleepwear matches the room temperature is key to keeping them safe and comfortable. While it’s natural to want to keep your little one warm and snug, as spring temperatures start to rise it’s important not to overdress or over-layer. Overheating can increase the risk of SIDS, so always check in on your baby to make sure they’re cosy — not too hot or too cold.

Layering Tips for Tricky Spring Weather

Choose natural, breathable fabrics like cotton or bamboo.
Skip blankets inside the cot (a sleeping bag is all they need).
Add or remove layers under the sleeping bag to adapt to the room temperature.

Spring Sleep Made Simple

At Anchor & Arrow, our sleeping bags and rompers are designed to make seasonal transitions easy - soft, breathable and thoughtfully created to keep your baby safe and snug. Explore our full sleep collection here.

Final Thoughts

Transitioning from winter to spring sleep doesn’t have to feel overwhelming. With a little know-how about TOG ratings, layering and fabric choice, you’ll keep your baby comfortable (and hopefully sleeping soundly!) as the seasons change.