my baby is not gaining lot of Mussel mass. she two and half months old and is still not chubby. is this a reason for concern. should she be chubby compulsory

A. You should see how much as your child gained after birth weight if your child is has gained a minimum of 1 kg in two months where basic is 500 grams in a month this is Idea not your child chubby you can only make your child healthy