"I suffered, tremendously, after the birth of my first son"
Sorry to hear that, seriously.
The difference is you didn't butcher you child. You were able to maintain. Anyone who cannot cope, should never be free to roam again. EVER. You can either hate them for what they did, or make excuses for it. But you cannot disagree with the fact that if they did it once due to circumstances, they could possible do it again. Allowing her to ever be free again would be nothing short of negligence on the part of the law.
Every once in a while you hear about a new mother killing herself.
This is why. Some women kill themselves. Unfortunately some kill their children.