Healthy calves are the result of consistent management throughout the entire lifecycle of the dairy cow. The focus is on modern sensor technology, targeted prevention, and intelligent herd management. This includes SenseHub® Dairy Lifetime, optimal colostrum management, digital heat detection, continuous health monitoring, and farm-specific vaccination strategies. A particular emphasis is placed on maternal vaccination against cryptosporidiosis. The presentation demonstrates how protection begins before birth, highlights the importance of colostrum and transition milk, and explains how cryptosporidia can be controlled without the use of antibiotics.