If you're late enough in your pregnancy that giving birth during your vacation is realistic, you're likely to be refused boarding or turned back at the border. Birthright citizenship tourism is much smaller of an issue than stated.
Because US has no other form of becoming a citizen other than naturalization.
Also frankly it's a bit silly when you are born to two residents of a country but don't become a citizen. Why does it matter what passports they hold if they live and work in america like american citizens? People being born on the same soil being given second class citizen treatment is pretty despicable imo.
