简述胎儿生长受限的因素。
(1)孕妇因素占到50~60%,如孕妇偏食、妊娠呕吐,摄入蛋白质、维生素及微量元素不足等;(2)其他因素:如妊娠合并症与并发症、胎儿因素(染色体或基因异常)、胎盘脐带因素等。
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