I can't seem to find anything quickly to support this but, I seem to remember reading something years ago where Chinese families were aborting female fetuses if their one government approved pregnancy was a male child.
I could be mistaken. I'm my memory is correct, however, they've done it to themselves.
Besides, how else are you going to build and maintain a million man army if you dont have an imbalance in the number of males in the population?
With the Chinese one child policy, IF the child Dies before it is one year old, they are allowed to have another. Since a male child, in China, is considered an "asset", and a female child a "liability", there is a hugely disproportionate amount of SIDS, and "accidental" (such as bathtub drownings) in the first year of a Childs life, amoug the sexes. So, YES, they have done it to themselves.