My baby boy is 3.5 months old and weighs only 5 kgs. His birth weight is 3.1 kg. He is on formula(similac) since birth. Should I try changing the formula?

A. Your child to gain 2 kg in 3 1/2 months which in which is an excellent weight gain I don’t know why are you willing to change the formula but if you want you can change but genuinely there is no need as your child is gaining very well with the current formula that you are giving