My baby's birth weight is 3 kgs and now he is 3 months and 15 days old and he is 5.5 kgs.is he gaining correctly or need to improve??

A. Look your child should have gained a minimum of 1500 g on top of the birthweight by completing the time of three months a child has gained 2 1/2 kg which is very very good so all in all the progress of the weight is going very well for your child