It sounds like a latching-on problem. If babies are getting latched on correctly, soreness is minimal. Most babies have to be taught the correct way to latch on. I'm speaking from experience here! With my first I thought I knew what I was doing, but in a week both she & I were miserable. She was hungry, I was sore, cracked, bleeding, frustrated, & exhausted, so I quit & switched to a bottle. Don't give up! I always regretted it! With the 2nd I got the help I needed from a lactation consultant & was hardly sore at all! So go get some help, from a lactation consultant or La Leche League member. There's nothing like having someone there with you helping (well, ok, it's a little embarrassing, but it works!).