valid identification number
(4) Valid identification number (A) In general For purposes of this subsection, the term “valid identification number” means a social security number (as such term is defined in section 24(h)(7) ). (B) Adoption taxpayer identification number For purposes of paragraph (3)(B), in the case of a qualifying child who is adopted or placed for adoption, the term “valid identification number” shall include the adoption taxpayer identification number of such child.