Neurodevelopmental and neurological features in children with hypochondroplasia.

Among school-aged children, 71% required special educational support and 29% had formal education, health, and care plans (EHCPs), statistically higher than both UK population prevalence and previously reported hypochondroplasia prevalence.

Formally diagnosed neurodevelopment disorders affected 20.5% of the cohort.

Specific learning disorders remained significantly more common than UK population prevalence estimates after Bonferroni correction, with higher observed autism and attention-deficit/hyperactivity disorder rates also identified.