The widespread use of digital devices has had considerable implications for Swedish preschools. While research has identified digital technology as a key learning resource, many preschool teachers are sceptical and lack in digital competence. The study reports on preschool student teachers’ experiences of a digitalization initiative in preschool teacher education and how the combination of slowmation and teaching and learning science influence professional development. The results provide insights on how professional development within science education can improve preschool teacher education.