Pjās and a 1 tog bag - 20 degrees isnāt too warm for a room and itāll drop a little overnight. Usually for 18-20 degrees we do pjās and a 2.5 tog sleep bag. So possibly they will need a blanket during the night but just depends if they run hotter/colder and if the room drops more.
My daughters just got a nappy on and sheās also got her comfort blanket and a 1 tog but she kicks them of when she gets too warm. My baby monitor says her room is 27 but Iāve got her windows open x
Little ones room is currently 24degrees and heās just in pjs, no vest or anything. Heās got a lightweight throw on his bed but heās currently not needing that x
Ours was 27 at 7 š think itās dropped to about 25/24 now. Just a vest and 0.5 tog bag