my son is on breast milk, and got this kind of pimples on head, bum and on edge of motion passing area. what could be the reason for heat rash kind pimples and how to fix. it's still a bit cold weather.

A. Could probably be like that but since it is spreading on the entire body it would be good that you get it checked with the doctor once to have a clarity whether it is a heat rash or something and according to that further assistance can be provided