The baby sleep sack is an essential sleep accessory to keep baby warm and safe all night long. But how do you choose the right size, the right TOG, and the right material? We explain everything for peaceful nights.
Why use a sleep sack instead of a blanket?
Pediatricians unanimously recommend sleep sacks over blankets for babies. Here's why:
- Safety: it's impossible for baby's head to get covered by the sleep sack, unlike with a blanket
- Freedom of movement: legs can move freely, promoting motor development
- Stable temperature: baby stays at the right temperature all night even if they move
- Bedtime ritual: putting on the sleep sack becomes a strong signal for baby that it's time to sleep
What is TOG?
TOG (Thermal Overall Grade) is the unit of measurement for a sleep sack's warmth. The higher the TOG, the warmer the sleep sack. Here's a TOG guide based on room temperature:
| TOG | Room Temperature | Season |
|---|---|---|
| 0.5 TOG | 24-27°C | Hot Summer |
| 1 TOG | 20-24°C | Spring/Summer |
| 2.5 TOG | 16-20°C | Autumn/Winter |
| 3.5 TOG | below 16°C | Harsh Winter |
How to choose the right size?
The sleep sack must be adapted to baby's size to be effective and safe. A sleep sack that is too large risks riding up over baby's face.
| Sleep Sack Size | Approximate Age | Baby Weight |
|---|---|---|
| 0-6 months | Newborn to 6 months | 3-9 kg |
| 6-18 months | 6 to 18 months | 7-13 kg |
| 18-36 months | 18 months to 3 years | 11-18 kg |
| 3-6 years | 3 to 6 years | 15-25 kg |
Materials: which one to choose?
Cotton
The most common and recommended material. Soft, breathable, and easy to wash, cotton is suitable for all seasons depending on its weight. Opt for organic cotton for sensitive skin.
Merino wool
Naturally thermoregulating, merino wool regulates baby's temperature in all seasons. It absorbs moisture without feeling cold. Ideal for babies who sweat a lot.
Velvet/Fleece
Very soft and warm, perfect for winter. Be careful to check the TOG to avoid overheating baby.
Bamboo
Ultra-soft, antibacterial, and thermoregulating, bamboo is ideal for babies with sensitive skin or those prone to irritation.
How to tell if baby is at the right temperature?
Touch baby's neck — it's the best indicator:
- Warm and dry neck: perfect temperature ✅
- Damp or warm neck: baby is too warm, reduce the TOG or the room temperature
- Cold neck: baby is cold, increase the TOG or add a layer of clothing
Discover our selection
At TrioNest™, we offer a selection of sleep sacks and bedding for all seasons, all ages, and all skin types.
👉 Discover our Sleep Sacks & Bedding collection
Conclusion
Choosing the right baby sleep sack ensures safe and comfortable nights for the whole family. Remember the essentials: adapt the TOG to the room temperature, choose the right size, and prioritize natural materials. Good night everyone!
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