1. When the adoptive child is less than eighteen years of age, no order of adoption shall be made until three months after the court shall have received the petition to adopt, except where the spouse of the adoptive parent is the birth parent of the child and the child has resided with the birth parent and adoptive parent for more than three months, such waiting period shall not be required. The judge or surrogate may shorten such waiting period for good cause shown, and, in such case the order of