Hey!! So I had my some 5 weeks ago, and so far we have been on four different formulas... First Enfamil Newborn and spitting up was terrible. We switched to Similac Advance and spit up again and fussy. Then Similac Sensitive and now my son is screaming for hours at atime not using the bathroom (bowel movement) for days, and spitting.. So we go to the doctor and the Nutrimagen(sorry if spelling is off the cans are in another room) and he is spitting up worse and fussing more?? I dont know if this is from switching him or from the formula itself. I am only getting about 2 hours of sleep a day if that!! I feel so sad for him and just want to know if I just need to give the new formula more time or if it shouldnt have ever gotten worse, tomorrow is Friday and I just would hate to have to wait til Monday if I needed the doctor.. Anyone advice, please.