of the third month beginning after such time, whichever first occurs). . (2) Effective date The amendments made by this subsection shall apply to child's insurance benefits that are payable for months beginning on or after January 1, 2024. (b) Railroad Retirement Act (1) Section 2(d) of the Railroad Retirement Act of 1974 (45 U.S.C. 232(2)(d)) is amended— (A) in clause (iii) of paragraph (1), by striking will be less than nineteen years of age and a full-time elementary or secondary school student and inserting will be less than 22 years of age and a full-time student at an educational institution (as defined in section 202(d)(7)(E) of the Social Security Act)