The department shall establish a program of supplemental postnatal assistance for those developmentally or intellectually disabled persons who during pregnancy received temporary assistance for needy families but whose assistance was revoked upon relinquishment of the newly born child for adoption. The supplemental postnatal assistance provided for in this section shall be at the same rate as temporary assistance for needy families, but supplemental postnatal assistance shall not exceed a period of sixty days. The department shall promulgate rules to carry out the provisions of this section.