Major changes to the CDC childhood immunization schedule are creating confusion—and risk. Dr. Zachary Rubin (Allergy/Immunology) and Dr. Melanie Matheu, PhD (Immunology) break down what changed, how vaccines are actually approved (FDA → ACIP → CDC), why herd immunity matters, and what this means for parents, pediatricians, and public health. We also discuss real-world vaccine side effects vs. vaccine-preventable disease, and where to find the American Academy of Pediatrics (AAP) schedule to review with your child’s doctor.