Inclusion Criteria:  Baby between 3 and 12 months of age at the time of inclusion Clinical signs of underuse of one of the two upper limbs, (reported by the parents and authenticated by the HAI) Unilateral brain injury Brain imaging performed at birth or upon initial parental concerns Possibility of a home visit by the occupational therapist At least one parent volunteering to actively participate in the intensive stimulation Parental consent to enter the study Consent for image rights  Exclusion Criteria:  Prematurity Lack of interest suggesting underlying associated disorders Active epilepsy