After the initial veterinary appointment for a kitten, follow-up visits are typically recommended at three to four-week intervals until the kitten is about 16 weeks old. During these visits, booster vaccinations are administered to build adequate immunity against common feline diseases. After completing the initial series, the next set of vaccinations usually occurs around one year of age. Subsequently, annual wellness exams are recommended, though some vaccinations might be given every three years, depending on the vaccine type and the cat's health and lifestyle.