During the first year, check-ins are generally more frequent, occurring at birth, then at 2 weeks, 2 months, 4 months, 6 months, 9 months, and 12 months. Between ages 1 and 3, visits usually occur at 15, 18, 24, and 30 months, and then annually from age 3 onwards. The specific schedule can vary based on the child's health and the recommendations of the pediatrician.