The usual choice will be to stay with the parents, but I could see a poor Irish or Bolivian or Serbian family deciding to abandon their child to Social Services rather than bringing the child back home.
You have no idea the terror and anger that can be inculcated in a child by such an action.
It is more important that a child be kept in a loving, secure family than separated due to politics.
Shame on you for suggesting otherwise.
The U.S.Government has already set a precedent with Elias Gonzalez.