My baby is 1month 20days old and his birth weight is 3.2kg now he is 5kg is this weight is ok for him?

A. 1800 g in almost 1 1/2 months is a very good weight gain for your child so the weight gain of your child is going good right now because the minimum gain should be somewhere around 500 g to maximum 1 kg kilogram so your child is gaining approximately the similar manner with the pattern of 1 kg kilogram in a month