my baby is 45 days old.. i shift to lactogen or similac formula milk and she had suffered with loose motions.. now i am giving zerolac.. with zerolac she does not have loose motions but when she have milk she passes the stool.. what to do?

A. gastrocolic reflex is very normal in children. in this phenomena the child is having semi solid to solid stool after every episode of of food / milk inztake. if the growth / weight gain of the child is proper there is no need to worryx about this phenomena. usually this phenomena decreases with increasing age of the child