Here is the way it would work. If it was discovered that the baby was a threat to the mother, than she could defend herself in court. If not then at the trial she would be accused of murder.
Every woman has the right to live her life without having her privacy rights infringed a warrant for the investigation for murder. In order to get a warrant, you need a damn good reason(remember, this is all theoretical). Innocent until proven guilty. This does not infringe upon the privacy rights of the woman. But if she is suspected by someone, (husband, family, etc...) then they can tip off the contract enforcers, and an investigation can be done in accordance with the law.
As for what will happen to unwanted children? I have never heard of one.
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