I've read women referring to their son or daughter as "chomping" on their breast and I'm wondering if my son is doing the same thing. He's 3 months and today he's been stopping at the nipple and pulling back slowly. I've let out an "OUCH" because it was really painful. He did it several more times while I was nursing him in the laying down position. Is this chomping that I've read about? I hope it doesn't become a habit!