A baby can’t tell you it’s too cold or too warm. In a Nordic or Baltic winter — where a morning can start at −15 °C and a shop can hit +22 °C — the answer is layers you can add and remove.
The Three-Layer System
Base layer. Next to the skin: merino wool or organic cotton. Merino regulates temperature and moves moisture, so a baby stays warm without sweating.
Mid layer. The insulation — a knit or fleece that traps warm air. Add or drop this as the temperature moves.
Outer layer. A windproof, water-repellent shell. Softshell keeps out wind and light snow while staying breathable during play.
By Temperature
+5 to 0 °C — cotton or merino base, a light knit, a softshell.
0 to −10 °C — merino base, a warm knit mid-layer, softshell or a padded suit.
−10 to −20 °C — merino base, thick mid-layer, insulated outer, plus hat, mittens and warm boots.
The Rule of One More Layer
A common guide: dress a baby in one more layer than an adult would wear in the same weather. A baby who isn’t moving generates less heat than you do.
Don’t Forget the Extremities
Heat escapes fastest through the head, hands and feet. A merino hat that covers the ears, mittens, and warm socks or booties matter as much as the coat. In a pram, add a footmuff or blanket — a still baby needs more, not less.
Overheating Is Also a Risk
Check the back of the neck, not the hands — hands run cool normally. If the neck is damp or hot, remove a layer. Never leave a thick snowsuit on in a warm car seat.
Related reading
How to choose a toddler’s winter softshell
Is merino wool safe for babies?
Newborn gift guide
What to pack in a hospital bag
Snøluv Atelier. Written to be useful — not to sell you something you don’t need.
