先天性畸形是指小儿出生时,在外形或体内有可识别的结构成功能上的缺陷(一般不包括代谢缺陷),而这些缺陷并非由分娩损伤引起。临床工作中,常见体格方面及外生殖器方面程度不同的畸形。近代先天畸形的发病率比过去有明显的增加,根据美国儿童尸解统计,1900年先天畸形占3.3％,1964年先天畸形占25％。Macvicar在1976年统计,临近出生前后死亡的婴儿,发现20％有先天畸形。由此可见,先天畸形并非罕见,目前估计, Congenital malformations refer to defects in the structure (usually not including metabolic defects) that are identifiable in the shape or body at birth, and these defects are not caused by labor injury. Clinical work, the common physical aspects and genital aspects of different degrees of deformity. In recent years, the incidence of congenital malformations have significantly increased. According to the statistics of American children’s autopsy, congenital malformation accounted for 3.3% in 1900 and congenital malformation in 25% in 1964. In 1976, Macvicar’s statistics showed that babies who died before and after birth had found that 20% had congenital malformations. Thus, congenital malformations are not uncommon, the current estimates,