N.J. Stat. § 9:3-44
Whenever a person receives a child into the person's home for the purpose of adoption other than from an approved agency, a complaint for adoption shall be filed within 45 days after receipt of the child. If the person receiving the child has been approved previously for placement for adoption in accordance with the provisions of section 18 of P.L. 1993, c.345 (C.9:3-39.1), the person shall, immediately upon receiving the child, notify the approved agency which granted approval of the receipt of the child, and that agency shall undertake immediate supervision of the child in accordance with rules and regulations promulgated by the Director of the Division of Child Protection and Permanency. The cost of the supervision shall be paid by the person receiving the child. If the agency, in the course of supervision shall determine that the child is at risk of harm or that the best interests of the child are not served by the child remaining in the home, the agency may apply to a court for removal of the child from the home. Whenever a person receives a child into the person's home for purposes other than adoption and it is later determined that an adoption shall be sought, a complaint for adoption shall be instituted with reasonable promptness following the determination. Failure to file the complaint in a timely manner shall not be a sole basis for refusal of the adoption but the failure shall require the filing, with the complaint, of an affidavit setting forth the reasons for the delay.
N.J.S. § 9:3-44