Gait in Young Children With NF1

Inclusion Criteria: * Children who are independently ambulatory who meet revised diagnostic criteria for NF1 * Children less than or equal to 71 months of age * Parent/Legal Guardian willing and able to provide parental consent. Exclusion Criteria: * Age ≥ 6 years old, inability to walk 10 meters independently, non-NF1 medical illness that alters their physical or neurological abilities that could significantly impact their performance. * Parent/Legal Guardian not willing and able to provide parental consent