While changing my newborn in the middle of the night, I totally overdressed him and woke up to find him with a heat rash. I've given him a bath and adjusted to just a thin, short cotton onesie now and he seems really comfortable. (I know, weird to be posting this in January but we live in the tropics so it's 28-30C outside, and with AC our room is cooled down to 25C) Does anyone have experience with heat rash? How long did it take to go away? Any tips to speed up the healing process?