As winter fades and the days start slowly warming up, many parents find themselves asking:
“Is my baby too hot at night?”
“Should I switch sleep sacks yet?”
“What TOG do I use now?”
Spring sleep transitions can feel confusing, but a few simple adjustments can make a big difference in your baby’s comfort and sleep quality.
Let’s break it down.
When Should You Switch TOGs?
TOG (Thermal Overall Grade) measures how warm a sleep sack is. The higher the TOG, the warmer it keeps your baby.
Here’s a simple guide for spring:
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2.5 TOG → Cold Winter Rooms (under 20°C)
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1.0 TOG → Ideal for Most Spring Nights (21–23°C)
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0.5 TOG → Warmer Spring/Summer Evenings or Well-Heated Homes (23–26°C)
In British Columbia especially, temperatures can swing a lot between March and May. Instead of switching based on the calendar, switch based on your room temperature.
If your baby’s room consistently stays above 20°C at night, it may be time to move from a heavier winter TOG to a lighter option.
Signs Your Baby May Be Overheating
Overheating can disrupt sleep and lead to frequent wakeups. Many parents mistake this for regression, when it’s actually temperature discomfort.
Watch for:
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Damp hair or sweaty neck
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Warm or flushed chest/back
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Restlessness and frequent stirring
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Waking up crying suddenly
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Rapid breathing
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Red cheeks (without illness)
💡 Tip: Always check your baby’s chest or back, not hands and feet. Hands and feet naturally run cooler.
If your baby feels hot to the touch under their sleep sack, it’s time to adjust.
What to Watch for During the Transition
When moving from winter to lighter sleepwear:
1. Don’t Change Everything at Once
If you’re lowering the TOG, keep pajamas consistent for a few nights before making additional changes.
2. Monitor Night Wakings
If sleep improves after switching to a lighter sleep sack, overheating was likely the cause.
3. Pay Attention to Morning Feels
If baby wakes up sweaty, strip back one layer the next night.
4. Consider Fabric, Not Just TOG
Breathable fabrics matter just as much as warmth.
At Belan.J, our 250 GSM bamboo sleepwear is designed to regulate temperature naturally, helping keep baby warm when it’s cool and breathable when it’s mild. That makes spring transitions smoother because the fabric adapts, instead of trapping heat.
Simple Spring Sleep Setup Example
For a 20–21°C room:
For a 22–23°C room:
Your baby’s sleep environment doesn’t need a complete overhaul, just small seasonal changes.
Spring is about lightening layers, increasing breathability, and paying attention to how your baby feels, not just what the calendar says.
If you’re unsure which TOG is right for your home, start by checking room temperature at bedtime for a few nights.
Comfort leads to better sleep, and better sleep leads to happier mornings for everyone 🫶.