Objective Previous studies suggested that a number of obstetrical factors were associated with small-for-gestational-age (SGA) infant.
目的探讨产科因素及孕母文化程度与小于胎龄儿（SGA）之间的关系。
Objective To observe the relation between human parvovirus B19 (HPVB19) intrauterine infection and occurrence of premature infant and full term for newborns small gestational age.
目的观察人类微小病毒B19 (HPVB19)宫内感染与早产儿、足月小于胎龄儿的关系。
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