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。
2
Objective To observe the relation between human parvovirus B19 (HPVB19) intrauterine infection and occurrence of premature infant and full term for newborns smallgestationalage.