Dear Pregnant Wife of a Wizard,
Evening primrose oil does supposedly release prostaglandins, hormone-like substances that are like the medications used to induce labor.
Acupuncture has been used with a 70% success rate of inducing labor. Women who get acupuncture also seem less likely to deliver by cesarean section.
Both of these should only be used when you are near term. I can't urge you strongly enough to always consult your healer. Whereas natures course is often one that can't be altered, you may simply have to wait.
There is no way of guaranteeing a healthy child and it would be unwise to attempt to alter a baby. I would not advise it.
May you have a healthy and obedient child.