Scientists Identify Cause of Morning Sickness, Potentially Ending Misery for Many

[Sympthsical]

2. It wouldn't be blocked for the fetus

That was my initial thought, too, but the article lays out that the problem is maternal underexposure to the hormone. Their proposed course of action isn't to block the hormone or alter anything chemically for the fetus, but to expose the mother to it enough pre-pregnancy to desensitize her and hopefully diminish its effects before her pregnancy starts manufacturing it.