sir my boy is 6 yrs old,but his weight is only 18 kg,activities are very good

A. I The child is active don’t worry about it is increase the proteins and carbs into your child’s daily diet try to give about 2 to 3 tablespoons of ghee to your child because that is a healthy fat so try to work upon these things for a better way again as of now it’s okay it is not that less also