preterm baby weight gaining slow now by breast milk birth weight 2 kgs now entered 3rd weight is 3.5 kgs any suggestions

A. Your child is getting very well as of now I must tell you with a premature child it’s expected to be about 350 g gain in a month and for a full term child it is more than 500 g minimum 500 g if you look at your child is minimum more than 500 g which is a very good