1, physiological jaundice, refers to full-term infants in 2 weeks, premature infants in 4 weeks appear, total bilirubin does not exceed 12mg/dl, the affected children eat milk well, good response. 2, horse teeth and mantis mouth, refers to the appearance of , small yellow-white particles on the oral mucosa, and a raised fat pad on each side of the cheek. 3, mammary gland enlargement, is due to the influence of maternal estrogen, 4-7 days to appear, 2-3 weeks to subside, do not squeeze, to avoid infection. 4.Pseudomenstruation, some female babies, 5-7 days after birth, vaginal discharge of a little blood, can last for 1 week, also due to the influence of maternal estrogen. 5, neonatal erythema and corn rash, 1-2 days after birth, in the head and trunk, limbs of varying sizes of polypoidal erythema, and around the nose of small rice-grain size yellow-white rash, a few days after the natural disappearance.