Hi mommies! I have a question. My son is 4 and he is vaccinated since day 1 but I only took him to…

Hi mommies! I have a question. My son is 4 and he is vaccinated since day 1 but I only took him to get shots like the first year then I stopped taking him so that means his shots is not complete. Well my question is can I still take him and maybe get the ones that he missed? Since I'm enrolling him to preschool soon and that's one of their requirements.