my son is 6.5 yr old and weight only 18 kg. he eats properly. no or minimal junk food. he us an active child otherwise.is it matter of concern. his height is 120 cm

A. hi as a child is active , showing no discomfort ,it is ok. it might happen because of increased activity level. so as such no need to worry give energy rich diet like nuts , dry fruits ,fresh seasonal fruits , atleast one banana a day to your child