That's the scare tactic doctors/nurses use to convince you to get your child vaccinated. Don't fall for it. My kids ages 9, 7 , and 2 have never received a vaccine in their life. Up until covid started they all went to preschool and public school, and they did just fine, only getting some seasonal bug. I keep this very private. Only (supportive) people in my immediate family knows about it. For my kids' safety, I've instructed them to never discuss it with anyone that's not us. Try to find a doctor that is open minded about vaccines, better yet switch your pediatrician for a family doctor who will be less inclined to push for vaccines.
Public schools don’t require proof of vaccinations?