infant or toddler with a disability

(A) means an individual under 3 years of age who needs early intervention services because the individual—

(i) is experiencing developmental delays, as measured by appropriate diagnostic instruments and procedures in 1 or more of the areas of cognitive development, physical development, communication development, social or emotional development, and adaptive development; or

(ii) has a diagnosed physical or mental condition that has a high probability of resulting in developmental delay; and

(B) may also include, at a State's discretion—

(i) at-risk infants and toddlers; and

(ii) children with disabilities who are eligible for services under section 1419 of this title and who previously received services under this subchapter until such children enter, or are eligible under State law to enter, kindergarten or elementary school, as appropriate, provided that any programs under this subchapter serving such children shall include—

(I) an educational component that promotes school readiness and incorporates pre-literacy, language, and numeracy skills; and

(II) a written notification to parents of their rights and responsibilities in determining whether their child will continue to receive services under this subchapter or participate in preschool programs under section 1419 of this title.

(A) means an individual under 3 years of age who needs early intervention services because the individual—

(i) is experiencing developmental delays, as measured by appropriate diagnostic instruments and procedures in one or more of the areas of cognitive development, physical development, communication development, social or emotional development, and adaptive development; or

(ii) has a diagnosed physical or mental condition which has a high probability of resulting in developmental delay; and

(B) may also include, at a State's discretion, at-risk infants and toddlers.