It is possible for a child to decide whether he or she wants the COVID-19 vaccine in some circumstances. This could be the case if your child is older, such as a teenager, and a doctor considers him or her competent to make the decision. Even if the child is under the age of 18, a judge may consider him or her a mature minor who can make his or her own medical decisions. If your child can decide, his or her wishes may potentially decide the outcome.