A well-child exam involves measurements, vaccines and an evaluation of your child’s development. Well-child exams help children and teens grow into healthy adults. A baby should have their first well-child visit when they are only a few days old and will continue to need regular check-ups until he or she is 21 years of age. Along with being an opportunity to check your child’s health and development, well-child exams are a great opportunity for parents and children to build a relationship with their pediatrician and the rest of the CHC staff.