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为了解不同类型胎儿体格发育（出生体重、身长、头围）情况及小于胎龄儿相关因素,自1999年5月～2000年12月,对在我院分娩的单胎活产新生儿及其母亲424对,进行前瞻性调查。结果显示:小于胎龄儿（SGA）36例,发生率为8.5％,适于胎龄儿（AGA）294例,大于胎龄儿（LGA）94例,SGA组除出生体重外,身长、头围三项指标均低,与AGA组有非常显著意义（P值均<0.001）。影响SGA体格发育Logis-tic回归分析:最主要危险因素为母孕早期剧吐、被动吸烟、贫血、羊水量过少和母患妊高征。母亲身高、文化程度、胎盘重量与胎儿体格发育呈正相关。SGA组新生儿生后五天内发病率最高为33.3％,与AGA组的2.7％比较有非常显著意义（P<0.01）。因此,防治常见妊娠合并症,加强孕期营养,提高自我保护意识,将有助于降低SGA发生。
To understand the different types of fetus physical development (birth weight, length, head circumference) and less than gestational age-related factors, from May 1999 to December 2000, delivery of single birth in our hospital and its 424 pairs of mothers, conducted a prospective survey. The results showed that 36 cases were less than gestational age (SGA), the incidence was 8.5%, suitable for 294 cases of gestational age (AGA), 94 cases of greater than gestational age (LGA), SGA group in addition to birth weight, Surrounding three indicators are low, with the AGA group has a very significant (P values were <0.001). Logis-tic regression analysis of physical development affecting SGA: The most important risk factors were early stage maternal gestational hypersomnia, passive smoking, anemia, oligohydramnios and maternal pregnancy-induced hypertension. Mother height, education, placental weight and fetal physical development was positively correlated. The highest incidence of newborns in SGA group was 33.3% within five days after birth, which was significantly higher than 2.7% in AGA group (P <0.01). Therefore, the prevention and treatment of common pregnancy complications, strengthen nutrition during pregnancy, improve self-protection awareness, will help reduce the occurrence of SGA.