I thought about getting an adult size bottle. But I never see any that looks like the new baby bottles, I also drink from the bottles that take a plastic inner bag, I used to do that when I was breastfed and mama didn't have the time to nurse me, it helps prevent Burpy build up. I have pink, blue, duckies, bunnies, Noah's ark, and clear bottles. I also have a feeding bottle cause sometime mama puts my baby food in it and feeds me that way. I am starting solid food.
I like the slow flow nipples or stage1 nipples because I am only 6 months old I need the milky to come out slowly or baby get messy.