Aww alam mo, sa init talaga yan common, prickly heat or heat rash talaga usually yan especially sa babies dahil sensitive pa ang skin nila, lalo na kung humid. Ang good news is hindi siya painful, pero i'd suggest mo lang i-check with your pedia para sure, kasi may different types ng rashes and you want to rule out kung hindi lang init-related. A few of us din nag-try ng lightweight cotton clothes, frequent baths with plain water (walang soap muna kung mainit lang talaga), at keep baby in cool place as much as possible, pero definitely go to your doctor para ma-confirm kung ano talaga at magkaroon ng peace of mind kang FTM!