Causes and risk factors of preterm birth

Abstract

In 1961, World Health Organization recommended that the concept of preterm birth is less than 37 weeks of gestation age newborn. The incidence of preterm birth has always been high and remains to be the leading cause of perinatal morbidity and mortality, despite the rapid development of global medical science level for decades. Studies on causes and mechanisms of preterm birth have become a hot spot worldwide. This paper is a summary analysis about the domestic and foreign research on preterm labor.The factors are divided into 5 broad, including categories-maternal factors, pregnancy factors, fetal factors, external factors and genetic factors, in order to popularize science of preterm birth and make for preterm birth prevention and clinical study. Key words: Preterm birth; Pathogen; Risk factor