So either the missing girls where aborted, killed, or once the family had a boy as the first child, they stopped having kids. Or people just ignored the policy altogether.
And central planning works how exactly?
And central planning works how exactly?
Anyway, to answer your question, the central planning works to reduce population growth.
Either outcome is a total failure of the ability of a repressive government to control its citizenry. One option is a moral failure, the other is a policy failure.