It's actually even worse for the assertion than this, because the genders of babies from the same parents are not independent statistical events. So, if you ha

It's actually even worse for the assertion than this, because the genders of babies from the same parents are not independent statistical events. So, if you have 1 B, you stop. If you have 1G, you may have another child, which is somewhat more likely to be a girl than a boy. So you'd expect this policy (in isolation) to produce a surplus of girls.