Not make it Illegal, but send it back to The States.
While in Idaho her baby is a legal person, but somehow when she gets off the plane in Massachusetts it ceases to be a legal person.
Such questions are why the progressives are so keen on making everything a "federal case". A gay couple married in Massachusetts moves to Idaho because one of them got a job transfer. They were married in Massachusetts but no longer in Idaho (if gay marriage was still a States' Rights issue). Now the company is confused about whether or not they can automatically provide insurance coverage to the now live-in boyfriend who ceased to be a husband.
Certain issues like what kind of car insurance drivers have to have make sense at the state level. But basic definitions of who is and who isn't a legal person, or what constitutes a legal marriage really need to be made at the federal level.
After all, don't we want to have a solid definition of citizen so we can deny entry to illegal aliens, and birthright "citizenship"? And don't we want to have a solid definition of "natural born citizen" so we have no further Obama's slipping into power?