my baby is on formula and she doesn't drink even half of the prescribed amount of milk for a three month old baby. how to make her drink more milk?

A. So What is the amount of milk that your child is having that you have not mentioned so you can give it every two hours if your child is not having good amount of milk at a point of time that’s going to help give small small quantities regularly I think that we are child will have sufficient amount of milk as it is