Every parent wants to keep their children safe, and vaccines are among the most powerful tools for doing that, making deadly diseases preventable. @WHO is concerned that recent changes to US immunization policy are not aligned with decades of evidence that show when children are most vulnerable to disease, when vaccines provide the strongest protection, how many doses are needed, and which vaccines can be given together safely. That evidence is reviewed continuously as new data emerge from across the globe. The current evidence is unequivocal: vaccines - including the MMR vaccine - are safe and do not cause autism. Delaying vaccines or separating doses unnecessarily does not make vaccination safer and can leave children unprotected. Global evidence and recommendations, including from @WHO, inform national experts, who consider local disease patterns, health systems and population needs, to determine which vaccines and schedules are best for their country. Vaccination policy should be guided by rigorous, independent and transparent review of the best available science, not by political influence.