How to Dress Your Baby Under a Sleepsack: A Season-by-Season Guide
Not sure how to dress your baby for sleep under a sleepsack? You’re not alone. One of the most common questions from parents is: “What should my baby wear under a sleepsack—especially in hot or cool weather?”
The good news is that once you understand TOG ratings and how to match your baby’s sleepwear to the room temperature, dressing your baby becomes simple and stress-free.
In this guide, we’ll walk you through how to layer your baby’s clothing under a sleepsack for every season, ensuring safe, comfortable, and restful sleep.
What Does TOG Mean in Baby Sleepwear?
TOG stands for Thermal Overall Grade—it measures how warm a piece of clothing or fabric will keep your baby.
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A lower TOG rating means the fabric is lighter and more breathable (great for warmer nights).
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A higher TOG rating offers more insulation (ideal for cooler temperatures).
Understanding the room temperature and pairing it with the right TOG-rated sleepsack is key to avoiding overheating or chills. Not sure what a sleepsack is or why it’s safer than traditional blankets?
Read our complete guide on why every parent is switching to sleepsacks.
These Tiny Things Sleepsacks: TOG Options
All our sleepsacks are made with breathable 95% bamboo and 5% spandex for a soft, stretchable fit. They’re available in:
0.3 TOG – Single Layer
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Ultra-lightweight
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Ideal for warm nights or room temperatures above 24°C
0.5 TOG – Double Layer
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Slightly thicker but still breathable
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Best for air-conditioned rooms or temps between 23–26°C
Both versions include:
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Dual zippers for easy diaper changes
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Zipper guard to protect delicate skin
How to Dress Your Baby Under a Sleepsack by Season
Use the following guide to decide how many layers your baby needs under a sleepsack.
Summer (Room temp 25°C and up)
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TOG: 0.3 TOG
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What to wear underneath: Lightweight short-sleeved onesie if it’s very hot
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Pro tip: Bamboo fabric naturally wicks moisture and keeps baby cool
Spring / Autumn (Room temp 22–24°C)
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TOG: 0.3 or 0.5 TOG depending on your home’s ventilation
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What to wear underneath: Long-sleeved onesie or Sleepsuit
- Pro tip: Feel baby's back of ears—not hands or feet—to check if they’re warm enough
Signs Your Baby Is Dressed Too Warm (or Too Cold)
It’s important to check on your baby’s comfort throughout the night:
Too warm:
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Sweaty neck or back
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Flushed cheeks
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Restless sleep
Too cold:
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Cool hands, chest, back, and back of ears
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Waking frequently
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Shivering
Adjust layers as needed to find the sweet spot for your baby’s comfort.
Final Thoughts
Learning how to layer your baby for sleep doesn’t have to be confusing. With breathable, TOG-rated sleepsacks and a few simple guidelines, you can rest easy knowing your little one is sleeping safely and comfortably—no matter the season.
Browse our TOG-rated bamboo sleepsacks at These Tiny Things and dress your baby with confidence every night.
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FAQ
How do I know what my baby should wear under a sleepsack?
Always check the room temperature first. Use a TOG guide to decide how many layers your baby needs. Start with one layer and adjust if needed.
Is a sleepsack warm enough on its own?
If you're using a TOG-appropriate sleepsack for your room temperature, it will usually be enough with minimal layers underneath.
Do I need different TOG sleepsacks for different seasons?
Yes. It’s best to have at least one lightweight (0.3 TOG) and one midweight (0.5 TOG) sleepsack to rotate depending on the weather.