Under normal circumstances, 4.5-month-old infants can add complementary foods, such as pureed vegetables, pureed fruits, iron-containing formula rice powder and other pureed foods. With the gradual maturation of growth and development, infants need to enter the lactation period of changing from pure milk to solid food at birth, i.e. adding complementary foods. When they start to add complementary foods, infants generally weigh 6.5-7kg, and can maintain a stable posture, control trunk movement, support sitting, and eat from a spoon, etc., which is mostly at the age of 4-6 months. Therefore, 4.5-month-old infants can add complementary foods. Adding complementary foods should follow the principles of from little to much, from one to many, from fine to coarse, from soft to hard. The main source of nutrition for 4.5-month-old infants is still breast milk or formula, but you can try to add a small amount of pureed food, and pay attention to the development of the child’s eating skills.