Has anyone experienced this ? My 2 week old baby got her formula changed 3 times and we tried the similac sensitive and theirs times she’ throws it up and other times she does fine and we always make sure to burp her after every feed but just recently we fed her and she threw up a lot and this chunk came out , I’m not sure what it is she hasn’t been pooping either which that’s why she got her formula switched in the first place and she’s been having really bad smelly gases I’m not sure what to do .. I’ll have to wait until tomorrow morning to call her dr .