It is recommended that babies add complementary foods after 6 months of age. Complementary foods should be added for the purpose of iron supplementation and in the form of puree, avoiding the addition of salt and other flavorings. Adding complementary foods at the right time is beneficial to the physiological and psychological health of infants, and it is usually recommended that babies can start adding complementary foods after 6 months of age, and it is not recommended to add complementary foods too early. For the first time, it is recommended that babies add complementary foods, mainly iron-rich purees and pastes, which need to be fully heated before intake, and avoid adding salt and other seasonings in the preparation. Iron-rich foods often added as complementary foods include iron-fortified formula and iron-fortified rice powder. Foods such as pureed fruits can be added gradually with age. After adding complementary foods, it is important to watch for gastrointestinal symptoms such as diarrhea and vomiting, as well as food allergy symptoms such as cough, fever and rash. If any of the above symptoms occur, it is recommended to go to the hospital promptly.