Supplemental foods are not recommended for babies over four months of age. Additional complementary foods are not currently recommended for babies before 6 months of age. This is because adding complementary foods too early may reduce the intake of breastmilk, resulting in an increased risk of illness due to a decrease in the nutritional factors in breastmilk. For example, complementary foods are not as clean as breastmilk or difficult to digest and increase the risk of diarrhea; or increase the risk of allergic diseases because babies cannot digest and absorb non-human proteins well. Breastfeeding is the mainstay for babies over 4 months of age. If breastfeeding does not meet the needs of the baby’s growth and development, it is recommended that the baby be fed with infant formula, and complementary foods can be added gradually after 6 months of age.