my baby is 3months 10 days her birth weight is 3.1kg and now her weight is 4.8 and height is 63cm and head circumference is 41cm ... these all are normal

A. Weight Is less actually rest of the things could possibly be normal because that depends on the birth height and head circumference at the time of birth only but wait I am very sure about that it is little less than it should have been as of now