Results Umbilical cord factor are the chief one .
结果脐带因素是新生儿窒息的首要原因;
Results : Umbilical cord factor , fetal distress , abnormal pregnancy time and high risk pregnancy are the major factors .
结果脐带因素、胎儿宫内窘迫、妊娠时限异常、高危妊娠是新生儿窒息的主要原因。