my son has too much heat rash. can I apply calamine lotion

A. Hello good morning !! Yes you can use it but before that ,do a patch test - apply a small quantity of lotion/cream on baby's hand and check the suitability. Put on soft muslin,cotton clothes preferably white and light colours which absorb sweat. Avoid hot water bath and bath during mid morning,noon and sunny hours as this might increase prickly heat rashes.