HELLO, YES, IT IS DUE TO EXCESSIVE HEAT. PUT YOUR SON AROUND 25-26DEGREE IE, UNDER A.C. APPLY LOCALLY LACTO CALAMINE LOTION WHICH CONTAINS CALANDULA OIL A NATURAL HERBAL REMEDIES.TWO TIMES AFTER BATH TO REDUCE BODY TEMPERATURE IF NO A.C FACILITY OTHERWISE ONCE A DAY. APPLY PRESCRIBED POWDER FOR YOUR PEDIATRICIAN. I HOPE THIS IS SETTLE YOUR PROBLEM. O.K, GOOD NIGHT, BYE.