Baby drinks mother's milk only for 5 min is that fine. her birth wt was 3.1 and 2 months 18 days old with 4.7 kg.is that fine

A. 1600 g in this much age is very very good safe to understand the logic behind calculating weight is a minimum of 500 g gain is expected every month so if you look at that your child has gained 1600 g 2 1/2 months which is a healthy weight gain