34 CFR §300.101

1. (a)General. A free appropriate public education must be available to all children residing in the State between the ages of 3 and 21, inclusive, including children with disabilities who have been suspended or expelled from school, as provided for in § 300.530(d).
2. (b)FAPE for children beginning at age 3.
   1. (1)Each State must ensure that—
      1. (i)The obligation to make FAPE available to each eligible child residing in the State begins no later than the child's third birthday; and
      2. (ii)An IEP or an IFSP is in effect for the child by that date, in accordance with § 300.323(b).
   2. (2)If a child's third birthday occurs during the summer, the child's IEP Team shall determine the date when services under the IEP or IFSP will begin.
3. (c)Children advancing from grade to grade.
   1. (1)Each State must ensure that FAPE is available to any individual child with a disability who needs special education and related services, even though the child has not failed or been retained in a course or grade, and is advancing from grade to grade.
   2. (2)The determination that a child described in paragraph (a) of this section is eligible under this part, must be made on an individual basis by the group responsible within the child's LEA for making eligibility determinations.