Bah, you want population control? Just have a war.

War isn't murder, its just two groups fighting it out until someone gives up, usually after some people have died.

By contrast the execution of inocent children is aborhent. It's one thing not to keep sickly children alive by pumping them full of drugs and giving then a heart transplant every two years. Its quite another to abandon and child just because you think it won't survive.