I strongly recommend grabbing a copy of Janet Balaskas' New Active Birth. She birthed her children actively and that included an 11'lber without a tear. Have heard this often, big babies without a single tear, where mum is birthing actively or a homebirth... managed births in hospitals, directed pushing etc is more likely to tear. Its a fabbo book!

On a personal note, my brother was over 10lbs and the midwives kept asking mum if they could check her stitches, and didnt believe her when she said she had none *rolls eyes*. She still says to this day that his birth was very easy, easier than the smaller bubs.