Baby Heat Rash

When my son is 3 weeks old had heat rash around his neck. I am not sure the factor which trigger this condition since we sleep in air conditioned room at controlled temperature 28C (is it too hot? But its a lot colder than typical closed room temperature in Malaysia. Also I did not keen to keep my baby in cold room which might trigger asthma and gas). A traditional healer gave me natural remedy to this heat rash which I found very effective. Cut bitter melon (also known as bitter gourd or bitter squash) into small pieces and boil them with a pinch of salt. Table salt will do. After the baby having his regular bath, just do the final rinsing with the boiled water of the bitter melon. Try it, no harm in practicing natural remedy. :)