Why do U.S. women in hospital births lie on their backs?

A) to quicken labor
B) to decrease the risk of vaginal tearing
C) for the convenience of physicians
D) All of these answers are correct.

The most likely reason for women in hospital births to lie on their backs is for the convenience of physicians. This position provides the doctor with the best visibility and access to the perineum during delivery, which can make the process easier and faster for the doctor. However, research has suggested that this position may not be the best for the mother and baby, and alternative positions such as upright or side-lying may be beneficial for a smoother, less painful, and safer birth.