can 3 month baby gain more than one kg per month is it possible

A. yes there he can it is considered that a newborn baby can gain half kg to 1 kg weight in a month Till the age of 5 months is considered to double the weight of his birth like if he was having 3 kg at the time of the birth Till the age of 5 months he will be of 6 kg and from 6 months to 1 year he will gain approximately half kg of weight per month