my baby is 7 month old,and his weight is 7 kg, how much weight to be required and how to increase weight

A. Look your child should be at least 500 g more than two times of the birth weight by completing the time of seven months so kindly calculate on the basis of the birth weight if you still feel that the child then in that case you should give a healthy diet good amount of protein so that your child picks up on the way over the progressing age