My LO drink NAN last time, cant poop for many days if she drink. everytime she drink she constipated. some elderly say its too "heaty"?? idk. but yeah i change to similac after that and its get better. As long as baby poop its ok, at the same time u can massage her tummy to ease the wind
as long as the poop is pasty and not hard, it's ok. frisolac worked for my LO