My baby girl is 45 days old. Her birth wt. is 2.5 kg. Now she is 3.5 kg. Its very less as children of her age have around 4.5 kg weight. What should I do?

A. good morning I would like to tell you that the baby's weight is absolutely perfect your child should gain 400 to 500 grams for months old baby has been able to do so you don't have to worry at all