This paper examines the transition experiences of child Supplemental Security Income (SSI) recipients just prior to and after age 18. We find that only a minority of pre-transition SSI recipients, ages 14 to 17, participated in training or rehabilitation activities and many had never heard of SSI work incentive provisions. Among post-transition young people ages 19 to 23, those off SSI are in better health and more likely to be working than those on SSI. However, many are struggling with incomes below poverty, about half have dropped out of school, and a third have been arrested.