my baby is 1 month pre term baby .When born weight is 2.25 kg and after one month near to due date ,he is 3.5 kg.In the may and june month how much weight we can expect as he will increase

A. Looking at the birth weight your child gained almost 1100 g in one month which is very good there a minimum expectation for a mature child would be 350 g to 400 g approximately in a month this is very good