Every baby and home is different, so the best guide for how to dress your baby at night is the room temperature — not the season.
The ideal sleeping environment is around 18–22°C, which is where babies sleep most comfortably.
Why Temperature Matters
Babies can’t regulate their temperature as easily as adults, so it’s important to help them maintain a steady warmth. Overheating increases the risk of discomfort and restlessness, while being too cold can also disturb their sleep.
What to Wear Under a Merino Sleeping Bag
Dressing your baby in light, adjustable layers is the best way to keep them comfortable. Here’s a general guide:
Room Temperature |
Recommended Layers |
| 16–18°C (Cool) | Merino sleeping bag + long sleeve bodysuit + long sleeve onesie or pyjamas |
| 18–20°C (Mild) | Merino sleeping bag + long sleeve bodysuit + footed leggings |
| 20–22°C (Comfortable) | Merino sleeping bag + long sleeve bodysuit |
| 22–24°C (Warm) | Merino sleeping bag + singlet bodysuit or light cotton layer |
| Over 24°C (Hot) | No sleeping bag - use a merino singlet bodysuit or light cotton layer only |
These combinations are guidelines only — always adjust based on your baby’s comfort.
How to Check if your Baby is Warm Enough
The best way to check your baby’s temperature is by feeling their chest or back with your hand.
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If it feels comfortably warm, they’re dressed appropriately.
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If it feels cold, add a light layer.
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If it feels hot or sweaty, remove a layer.
Your baby’s hands and feet often feel cooler — that’s normal and not a reliable indicator of their core temperature.
Flushed cheeks or damp hair may indicate overheating.
Why Choose Merino Wool
Merino wool naturally helps regulate temperature — something babies can’t do on their own.
It’s breathable, moisture-wicking, and insulating, helping keep your baby warm when it’s cool and cool when it’s warm.
That’s why a merino base layer (like a bodysuit or leggings) paired with a merino sleeping bag is ideal for year-round comfort.
Tips for a Comfortable Night's Sleep
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Keep the nursery around 18°C if possible — a room thermometer can help you monitor it.
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Avoid using extra blankets or loose bedding.
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During cooler months, layer up with merino base layers.
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In warmer weather, switch to lighter cotton or merino singlets and skip the sleeping bag if it’s over 24°C.
