The Baby CHAMP Study is a multisite clinical trial funded by the National Institutes of Health that is examining the the use of constraint-induced movement therapy (CIMT) for infants and toddlers as a effective treatment, since there have been no randomized control trials (RCT) for the age range as well as monitor the stress levels as related by self-report of parents or biological indicators. Infants and toddlers who meet study eligibility requirements at one of the three clinical sites (Charlottesville, VA, Columbus, OH, and Roanoke, VA) will be invited to enroll, and their parents will be provided all necessary paperwork along with informational documentation.