yes i am breast feeding so i guess it could be from that. it was a pretty hot day yesterday, the rash isnt in those areas that you suggested. i gave her a cooler bath and put her in singlet and nappy and also put fan on and after a while it seemed to go down a little (the pimply marks were still there but they werent as red). if it is heat rash how long until it goes away, it doesnt look very nice or comfortable.