The purpose of this project is to evaluate the efficacy of Sitting Together And Reaching To Play (START-Play), an intervention designed to target sitting, reaching, and motor-based problem solving to improve development and readiness to learn in infants with motor delays or dysfunction. There is limited research examining the efficacy of early physical intervention on infants with neuromotor dysfunction. In addition, most early motor interventions have not been directly linked to learning, despite the research demonstrating an association between motor activity and cognitive skills. START-Play specifically targets motor skills that lead to greater physical exploration, which has been associated with improved problem solving and global development. A randomized controlled trial of START-Play will be conducted across four states to investigate the impact of the intervention on changes over time in sitting and reaching, subsequent changes in global cognitive development, and the mediating influences of motor skill changes and problem solving. The research team will conduct a randomized controlled trial to evaluate the impact of START-Play on motor development, motor problem solving, global development including cognitive problem solving of infants with neuromotor delay and dysfunction. Infants will experience either the intervention or services as usual for 3 months, with following testing at three time points up until 9 months post intervention. The researchers will determine whether the intervention leads to improved sitting and reaching, which leads to improved motor-based problem solving, which leads to improved global development and problem solving.