What is a surrender of parental rights? Can a birth parent change his/her mind after signing a valid surrender?

A surrender of parental rights is a signed consent to place a child for adoption and surrender of all parental rights by a biological parent. It can only be taken by an adoption agency, approved by the state of NJ, at least 72 hours after the birth of the child. Once a valid, agency surrender has been signed, it is irrevocable. A biological parent can only contest a surrender in court if he/she is able to prove fraud, duress or misrepresentation on the part of the adoption agency in the manner in which the surrender was obtained in taking the surrender.