his weight is 12 kg is it good? But he is very active.. he eat everything but he is underweight. what should I give him to eat ?

A. it is on the lower side consult doctor deworming twice a year give small frequent meals add ghee to every meal good protein from egg , non veg, sprouts, chana sattu, pulses, beans powdered nuts to food, dry fruits , paneer include seasonal fruits and vegetables in daily diet