; and (BB) the first date on which the child attends full day kindergarten. (bb) Requirements Each State that certifies a child under item (aa) shall— (AA) ensure that the participant child receives required health and nutrition assessments; and (BB) establish a system to determine the first date on which a participant child attends full day kindergarten. . (c) Conforming amendment Section 1902(a)(53)(A) of the Social Security Act ( 42 U.S.C. 1396a(a)(53)(A) ) is amended by striking below the age of 5 and inserting (as defined in that section) . 3. Certification of infants (a) Definition of infant Section 17(b) of the Child Nutrition Act of 1966 ( 42 U.S.C. 1786(b) ) is amended by striking paragraph (5) and inserting the following: (5) Infant The term infant means— (A) a person under 1 year of age; and (B) for purposes of subsection (d), a person under 2 years of age. . (b) Certification Section 17(d)(3)(A) of the Child Nutrition Act of 1966 ( 42 U.S.C. 1786(d)(3)(A) ) is amended by adding at the end the following: (iv) Infants (I) In general Subject to a waiver under clause (vi), not later than October 1, 2027, a State shall certify an infant for a period of not more than 2 years. (II) Assessments In certifying an infant under subclause (I), a State shall ensure that the infant receives required health and nutrition assessments. . 4. Extension of postpartum period (a) Breastfeeding women (1) Definition of breastfeeding woman Section 17(b) of the Child Nutrition Act of 1966 ( 42 U.S.C. 1786(b) ) is amended by striking paragraph (1) and inserting the following: (1) Breastfeeding woman The term breastfeeding woman means— (A) a woman who is not more than 1 year postpartum and is breastfeeding the infant of the woman