My baby has never liked sippy cups she will only drink from a regular cup (with my help tilting it) sometimes when we go out to eat I will notice she will want what were drinking (non alcoholic) so what I do is put my finger on the top of the straw and put the bottom part in her mouth then release my finger off the top of the straw so the soda or water can go in her mouth I've started to notice she will suck out the drink from the bottom part but when I try to let her drink out of the straw normally she will just chew on it , she's 9 months when will she drink normally from a straw ? And btw I know soda is bad for babies I don't give her soda or juice everyday it's just once in a while like maybe once every week or so.