Baby won’t drink his bottles anymore (11 months old)

Savannah • Rainbow baby born 4•12•2019🌈 💙

Anyone have this issue before or have any clue as to maybe why? He started doing this at 11 months old, he will be 1 year old on April 12th. He picks up his bottle takes a sip and throws it and isn’t taking in much formula, he used to want to eat a lot so this is odd. He will eat any foods he can feed himself no problem, while i feed him he doesn’t seen to eat as much as when he feeds himself. Could he be just over formula? Idk whats going on