Q&A: Wild mood swings with pregnancy?

First, let's talk about the phenylalanine. If concentrations of this are too high, the baby could have problems with brain development. So a treatment regimen of this for her mood swings is not advisable.

Now for the much more serious part. These aren't just mood swings you're talking about. This sounds more like a psychiatric condition. When a person is "not herself" to the point of divorce or hurting others, this person needs psychiatric intervention without fail. Yes, there are medications she can take, approved by a specialist in maternal-fetal medicine, of course.

Forget the phenylalanine -- she needs to see a psychiatrist, psychologist, or at least a social worker. As soon as possible! This regression of behavior isn't normal and is probably a variation of postpartum depression -- even though she hasn't delivered yet.