Its a bit comparing apples to oranges though in the case of birth defects. A lot of people are barely capable of handling regular parenting.. throw in a life-long crippling ailment?? Do you know how many people I see that go running away when they even have to substitute teach special needs kids? A lot of people aren't prepared for, or cannot handle that sort of situation. Having a girl instead of a boy isn't going to cost you years and years of specialized care and hospital bills.