Formula Crisis

My son and daughter were on a special formula for stomach issues and we put our new baby right onto the same formula assuming she would need it. The pediatrician in the hospital said if she doesnt have any kind of stomach problems it could cause them. Im going to visit our pediatrician tomorrow to get his point of view. I hate the idea of having to start with regular iron formula and have the spitting up and constipation when shes doing so well with what we have her on, as did the other children.