1, physiological jaundice: 2-3 days after birth, 4-5 days for the peak, generally no more than 14 days, jaundice value does not exceed 12.9mg/dl. 2, horse teeth and mantis mouth: in the oral palate midline and gingival areas, there are yellow-white, rice-grain-sized particles, is the accumulation of epithelial cells or mucus gland secretion accumulation formed, commonly known as horse teeth, can naturally subside after a few weeks; each side of the cheeks have a raised The fat pad on each cheek is conducive to sucking milk. Both of them are normal and should not be picked to avoid infection. 3, enlarged mammary glands and pseudomenstruation: newborns of both sexes can have enlarged mammary glands 4-7 days after birth, such as the size of a bean or walnut, which will subside in 2-3 weeks. This phenomenon is related to the fact that newborns are born with a certain amount of estrogen, progesterone and prolactin from the mother’s body, and some affected children can even secrete some milk from the breast, do not squeeze to prevent infection. Some female babies have a small amount of bloody vaginal discharge or a large amount of non-purulent discharge from 5 to 7 days after birth, which can last for 1 week, due to the sudden interruption of estrogen from the mother. 4, neonatal erythema and corn rash: 1-2 days after birth, in the head, trunk, limbs often appear varying in size of polypoidal macules, become neonatal erythema, 1-2 days after the natural fading. It can also be due to the accumulation of sebaceous glands, in the tip of the nose, nose, face to form a small rash of yellow-white size, become a newborn corn rash, peeling skin after the natural fading.