Cool days sit between a sweater and a jacket: a warm sweater over a long-sleeve bodysuit, and a warm hat, with the jacket held back until below 10°C.
For a baby of 6–12 months on a still, dry day:
13°C (55°F): long-sleeve bodysuit, pants, socks, warm sweater and warm hat. Cool — a mid layer plus a hat. 12°C (54°F): long-sleeve bodysuit, warm pants, socks, warm sweater and warm hat. Cool — a mid layer plus a hat. 10–11°C (50–52°F): long-sleeve bodysuit, warm pants, warm socks, warm sweater and warm hat. Cool — a mid layer plus a hat.
Lined trousers come on below 13°C and wool socks below 12°C. Wind and rain make it feel colder than the number, and the app dresses for how it feels. In rain below 20°C a jacket goes on to keep the layers dry, even where it isn't needed for warmth.
Take the hat and outer layers off once you are inside, or in a warm car, bus or train.
Each piece comes on at its own temperature, a degree or two apart, so the outfit changes one piece at a time.
One light layer from 20°C, covered arms below.
Pants below 25°C (toddlers keep shorts to 21°C), lined ones below 13°C.
Socks below 24°C, warm ones below 12°C.
A sweater below 19°C, a warm one below 14°C.
A warm hat outdoors below 15°C.
0–3 months, 12°C: long-sleeve bodysuit, warm pants, warm socks, warm sweater and warm hat. 3–6 months, 12°C: long-sleeve bodysuit, warm pants, warm socks, warm sweater and warm hat. 6–12 months, 12°C: long-sleeve bodysuit, warm pants, socks, warm sweater and warm hat. 1–3 years, 12°C: long-sleeve bodysuit, pants, socks, warm sweater and warm hat.
Still and dry: Cool — a mid layer plus a hat. Windy (feels like 9°C (48°F)): Adds warm socks and jacket. Drops socks Raining (feels like 11°C (52°F)): Adds warm socks and jacket. Drops socks Sunny (feels like 14°C (57°F)): Adds pants and light sweater. Drops warm pants and warm sweater In a carrier (your warmth counts on the body): Warm sweater becomes light sweater In a car seat (no coat under the straps): No change
Indoors, or in a warm car, bus or train, take the hat and outer layers off.
Check the neck — warm but not sweaty means just right.