I'm having this issue where no matter if my son is drinking regular milk or cereal, his shirts are…

I'm having this issue where no matter if my son is drinking regular milk or cereal, his shirts are always soaked. Somehow when he is sucking his bottle the milk always comes out on the sides. Idk if he is spitting it out as he is drinking, which I highly doubt or what. We use the playtex bottles with the natural latch nipple.