Most of the baby’s stools are golden yellow or yellow-green is normal, occasionally slightly green and thin, or ointment-like, uniform, with a sour smell and no foam. Formula-fed babies have less stool, which is usually dry, coarse and slightly hard like hard paste, but it’s okay as long as it’s not difficult to solve and doesn’t look like goat stool. If there are no digestive problems, the stool will usually be earthy yellow or golden yellow, with some sour smell, about 1~2 times a day. This is because the iron content of formula milk is very high, when the baby does not fully absorb the iron in the infant formula, the excess iron will make the stool greenish, this is normal. Babies start to add complementary foods from 4 months, as the number and types of complementary foods increase, the nature of the baby’s stool slowly began to approach that of adults, began to become darker. The color will be dark or green when eating more vegetables, and red fruits will be red when eating more red fruits. As long as the baby is healthy and lives a normal life, parents should not worry about the baby’s stool. Occasionally, when the stool is abnormal, we should observe whether it is accompanied by an increase in the number of stools, abdominal pain, fever, etc. to determine the specific situation.