"My mother never came quickly or lightly to the decision that one of her patients should go to a hospital" [p. 62]. Why not? What does the act of home birth symbolize for Sibyl, her patients, and the other midwives?
I think that a hospital is seen as more of an institution to Sibyl. To her it's unnatural and against her morals.
Also, for Sibyl and other midwives a hospital is like a competing company. It would be like a Mom and Pop store up against Wal-mart. Agree?