K. D. v. Downingtown Area School Distri

BIBAS, Circuit Judge.

When schools use their expertise to address each child's distinct educational needs, we must give their judgments appropriate deference. Endrew F. ex rel. Joseph F. v. Douglas Cty. Sch. Dist. RE-1 , --- U.S. ----, 137 S.Ct. 988 , 1001-02, 197 L.Ed.2d 335 (2017). The Individuals with Disabilities Education Act (IDEA) "requires an educational program reasonably calculated to enable a child to make progress appropriate in light of the child's circumstances." Id. at 1001 . But we may not "substitute [our] own notions of sound educational policy for those of the school…