Miss. Code § 93-17-23
Any child heretofore adopted under the laws of the State of Mississippi and any child who may have been adopted under the provisions of this chapter, may be re-adopted under the provisions hereof. If any such prior adoption is valid, and the re-adoption proceedings be instituted by the persons who previously adopted the child, there shall be no waiting period and no investigation and no interlocutory decree, and a final decree of adoption may be granted by the court ex parte if it be to the best interest of the child that it be re-adopted. If the re-adoption be by any person who was not a petitioner in the prior adoption or adoptions, then in such re-adoption proceedings, the persons who previously adopted the child shall be substituted in the place and stead of the natural parent and the same procedure shall be followed as if such child sought to be re-adopted was being for the first time adopted under the provisions of this chapter.
Miss. Code § 93-17-23