How do you become a schoolchild? What does it mean to become a schoolchild? For many children around the globe the path from early childhood education to school is probably quite clearly mapped out. Many countries, including Sweden, organize school in a way in which children typically follow their age group through their educational journey. Age is the primary organizing factor for the school class as well as for the content of school. Children attend school with other children in Sweden born the same year. They study school subjects with a content that is adapted to their age and is tested on this content in relation to their age. They are also expected to follow the school's progression in a specific order and in a specific rate. You are a preschool child who becomes a schoolchild, a first grader who becomes a second grader, and a primary school child who become a secondary school child. But what happens when this order is broken and a child does not follow this predicted order? What does it mean for children when they or others do not follow the norm of school progression? In addition, how can teachers work with children that can be said to ‘fail’ the timetable of school? This chapter explores children’s different experiences of transition focusing on children who can be said to derivate from the pace and rate of the transition to school – children with different experiences of starting school.