Yes, "voluntarily?". Think of the emotional stress and physical strain of the mother at the time; that is when the vultures of the STATE come in for their prey. Both mother and father are unsuspecting, unwitting and uninformed as to the mechanism that has just usurped the innocent nativity of their newly born baby. And, if the mother or father should question in any way whether or not to do this "normal" act of giving information, then the coercion, bully tactics and fear mongering ensue.
Yep, sounds like a knowing and willing agreement between two parties to me.