胎儿自出生后,从脐带结扎起到刚满28天为止的4周时间,称为新生儿期。由于胎儿出生后内外环境发生了剧烈的变化,婴儿需要适应外界环境,开始独立生活,但因其生理调节和适应能力还不够成熟,因此,婴儿在新生儿期有一些特殊的表现,其发病率也比较高。新生儿生理性黄疸就是新生儿体内氧分压比胎儿期提高,红细 Fetal since birth, from the umbilical cord ligament just up to 28 days up to 4 weeks, known as the neonatal period. Due to dramatic changes in the fetus after birth, the baby needs to adapt to the external environment and start an independent life, but because of its physiological regulation and adaptability is not mature enough, therefore, the infant has some special features in the neonatal period, the incidence Also higher. Newborn physiological jaundice is the neonatal body oxygen partial pressure than the fetus to improve, red fine