Paternalism in obstetric care is legally dangerous. An obstetrician who tells a patient not to worry because everything will be fine is making a guarantee on the outcome of a pregnancy with almost no ability to influence that outcome.
Consent is a simple problem made complicated by misinformation.
A pregnant woman is the only person who may consent to her medical care. This is always true for adults, and in most states a pregnant minor has the right to consent to her medical care. Neither husbands, lovers, prospective grandparents, prospective adoptive parents, nor adoption agencies have a right to consent to, or interfere in, the medical care of the pregnant woman. Any discussion of the woman's medical care with such third parties is a violation of the patient's rights unless she has given her explicit permission.