If the baby is atypically large, vaginal birth will be more complicated. There is a risk of prolonged labor in which the fetus might be stuck in the birth canal, instrumental delivery (with forceps or vacuum) may be needed, and even unplanned or emergency cesarean section may be
necessary. During birth, there is a greater risk of laceration and tear of the vaginal tissue than when the baby is of normal size, and the muscle between the vagina and the anus might tear (perineal tear).
There is also a high chance of uterine atony.