Comfortable room — a light top and socks.
For a baby of 6–12 months, awake, in a 23°C (73°F) room: short-sleeve bodysuit and socks.
Short sleeves from 21°C, covered arms below.
Socks below 24°C, warm ones below 15°C.
0–3 months: short-sleeve bodysuit and socks. 3–6 months: short-sleeve bodysuit and socks. 6–12 months: short-sleeve bodysuit and socks. 1–3 years: T-shirt.
At 22°C the answer stays the same.
At 24°C it changes to short-sleeve bodysuit.
Runs warm: the app dresses a touch lighter, short-sleeve bodysuit.
For sleep in the same room, the app suggests short-sleeve bodysuit, in a 1.0 TOG sack.
No hat indoors — a baby cools through the head.
Check the neck — warm but not sweaty means just right.