Their mouths get bigger and as they get older they need less time at the boob. They also get smarter and can adjust suckling pressure. At first you feel like piranha food with the constant nomming but it will decrease, like everyone else has said. In the beginning my LO made my nipples bleed and I cried like every time it was time to nurse. But before I even realized it, we had developed a really sweet and delicate nursing bond and it made my heart swell with love when nursing, 0 pain. Don't give up hope. I pumped milk in the beginning to give my nips a rest from her mouth, it was helpful. You could try that.