my son is 5year 3months old .some time there is too much hair fall while oiling his hair and washing

A. hi it happens because of nutritional deficiencies or excess usage of cosmetic. so , first ,do oiling with pure coconut oil everyday. use gentle shampoo like Babyhug shampoo for washing your child hair. give Healthy diet which includes fruits like apple, pomegranate, Amala etc . keep your child well hydrated. avoid frequent head baths. avoid tight hair styles.