my son is 3 yrs old now but still he is not eating proper home cook food and his weight is 13 kg only so what should we do to eat food

A. weight for age of the child is fin 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 diete