Well, the govern-cements do own the children.

The parents abandoned them at the hospital.

Of course this is all legalese, and just a legal game, but it is the law.
When you register something, you are giving it to the state, and they in turn give you exclusive privileges to use it. So, if you registered your car, the state owns it. And, since you registered your children...

A berth certificate is a statement of all of the goods you brought into the dock. And, when you leave the dock, you take that certificate back. It is the actual claim on all the goods.

When you go to the doc, to have a birth. They keep the birth certificate and give you only a copy.

So, legally speaking, you abandoned your children at the hospital.