Perinatal stroke causes lifelong neurological disability and most hemiparetic cerebral palsy (CP). With morbidity spanning diverse aspects of a child's life and lasting for decades, global impact is large, including 10000 Canadian children. With pathophysiology poorly understood and prevention strategies non-existent, the burden of hemiparetic CP will persist. Limited treatments lead to loss of hope for children and families, necessitating exploration of new therapies. The investigators have evidence that the investigators have a durable new treatment for perinatal stroke, combining non-invasive neurostimulation and child-centred intensive rehabilitation. Via the CHILD-BRIGHT SPOR national network, the investigators will execute a multicentre trial to prove this treatment can improve function in children with perinatal stroke and hemiparetic CP. Using novel advanced technologies not available elsewhere in the world, the investigators will explore how developmental plasticity determines function and response to neuromodulation therapy. This patient oriented effort will advance personalized, precision medicine in pediatric neurorehabilitation to improve outcomes for disabled children and their families.