Help!!

Alexis

So my son was EBF for the first 6 months we slowly transitioned into bottle when i went back to work and also formula because my supply went down extremely he now only does formula but at 9 months he can only drink from a 3+ bottle when i try the 6 months tops the milk goes to fast and to much and he can’t do it is this okay i feel like he’s just going to be using the 3 month bottle until we do sippy cup 😩