Soy milk is not recommended for six-month-old babies. Six-month-old babies are just starting to add complementary foods, usually the first complementary food is high iron rice flour, and then gradually add other foods such as fruit puree. Soymilk should not be added to the list of complementary foods too early. Soymilk contains a variety of anti-nutrients such as phytic acid, saponins, erythrocyte lectins, and trypsin inhibitors. These may cause damage to the gastrointestinal tract of babies with fragile stomachs. Symptoms of gastrointestinal discomfort such as nausea, vomiting, abdominal pain and bloating are likely to occur after ingestion. It can be added gradually when the baby is a little older. Soymilk is nutritious but not irreplaceable. Babies around six months still need to take milk powder as the main, the nutrients in milk powder can basically cover the nutrition of soymilk, so there is no problem of nutritional deficiency. Six-month-old babies start to add complementary foods, must be gradual and master the scientific method. If uncomfortable symptoms appear during the process of adding complementary foods, it is recommended to seek medical advice as early as possible.