• Aged 4 to 13 months, corrected age

• Diagnosis of CP or classification of high-risk for CP as determined by published guidelines (\>95% risk of later CP)

• Hammersmith Infant Neurological Exam (HINE) arm asymmetry score of greater than or equal to 2 and/or neuroimaging consistent with perinatal involvement

• Hand Assessment for Infants (HAI) difference between hands ≥2, with an observable and relative difference in quality or amount of movement between hands, as determined by HAI-certified study therapists and/or a unimanual Bayley score difference between hands \>1

• Parent/legal guardian is able to provide informed consent