Efficacy of a Physical Therapy Intervention Targeting Sitting and Reaching for Young Children With Cerebral Palsy

Inclusion Criteria: * Dx or clinical signs of cerebral palsy (CP) previously described * Between 8-24 months of age (corrected for prematurity as applicable) at study entry * Able to prop sit for 3 seconds, maintain the head at least to the level of neutral alignment with the trunk supported at the axilla, exhibit some spontaneous movement of the arms and visually focus on a toy or person's face for at least 3 seconds in any position. * Gross motor delay with a Bayley IV gross motor subscale score less than 5.5 (1.5 standard deviation below mean) Exclusion Criteria: * Medical complications that severely limit assessments/intervention participation such as severe visual impairment, congenital/orthopedic anomalies that limit sitting or reaching, or uncontrolled seizures. * A child will be excluded if the parents report any of following: 1) disability of a progressive nature such as muscular dystrophy or leukodystrophy; 2) family plans to move out of the local area within one year from the start of the study; 3) major surgery planned that might affect physical performance. 4) genetic conditions that have a similar presentation to intellectual disability or autism.