what is ideal weight for 3 to 4 months baby? if it is less than ideal weight, what should do?

A. U I haven’t mentioned the birth weight of the child so I tell you if your child is gaining a minimum of 400 g every month a minimum of 1200 g in three months in addition to the birth weight then it is going to be ideal if it is less than that then that means your breastfeeding isn’t appropriate for the child so you can go for formula