Most Popular heat rash in the item: question Mamamia1215 : How can I treat heat rash in the course of pregnancy I developed a heat rash under my breasts. I tried to place child powder and powdered medical on them, but they have not helped. ? Very best Answer any ideas: response Dom M maintain washing and keep it dry (not wet), there are some sudocreamoder some get away from the physician .. What do you think? Answer below!