What kind of formula is everyone using? Have you switched? My LO has tried them all. We got a bunch of samples and I went through all of them, they sent me similac and enfamil through the mail. They were the 2oz ready made bottles so they were super convient to just throw it in my diaper bag. Then we used enfamil newborn (powder) which daddy said was making her constipated so we now switched to enfamil gentlease (powder) which is now also making her more fussy than before. She's more breast fed than anything else. But I'm thinking about going back to newborn powder again. What do you guys think?