Updated edition includes additional information on mRNA vaccines, herd immunity, and more! A fun, friendly, and fact-filled guide to how vaccines keep us healthy—perfect for curious kids and science-loving families! This engaging picture book turns big science concepts into easy-to-understand, delightfully illustrated explanations even the youngest readers can enjoy. In Baby Medical School: Vaccines little learners discover what germs are, how the immune system fights them, why some germs are especially dangerous, and how vaccines help protect our bodies. With bright, expressive characters—antibodies, immune cells, mRNA, and more—kids get a friendly introduction to the science of staying healthy. Through playful art and simple storytelling, this book shows children: How the immune system recognizes germs What antigens and antibodies do Why vaccines are important for everyone What herd immunity means—and how it protects newborns and vulnerable people How scientists make different kinds of vaccines, including mRNA vaccines Perfect for reading at home, in classrooms, or before doctor visits, this accessible STEM book empowers kids with real science and helps them feel confident and curious about how their bodies work.