My 68 days old baby (34 weeks gestation) was introduced to formula milk Similac 1 because of my low milk supply. We started to give him when he complete his 2 month . He was quite gassy but after giving that he was first constipated and then passing liquid stool. we stop giving him formula milk( he was giving 2 times formula milk rest of the time rely on breastmilk) suggest me formula milk which will suit him.