You basically hold your hand in the shape of a C and smash your breast like you're holding a hamburger. It pushes your nipple out so baby can get a better latch. Also, was your baby checked for tongue and lip ties?

@missyjill, the "hamburger" is a technique to help your baby latch better. Here is an article on it: ссылка

@ciraclesmiracle, I meant 3 and a half month old. What's the "hamburger"?

3 and a half month or week? Do you do the "hamburger"? Have you tried nipple shields?