孕妇在妊娠各期对营养物质的需要量必须有很大增加，然而孕妇一般只注意补充蛋白质、脂肪、糖、维生素含量较多的食物，对微量元素的补充未引起足够的重视。微量元素是人体生理机能和代谢必不可少的物质，它直接影响人体的生长发育［１，２］，尤其是孕妇体内微量元素含量的变 Pregnant women in the pregnancy needs of nutrients must be greatly increased, but pregnant women generally only pay attention to add protein, fat, sugar, vitamin content of food, the trace element supplementation has not attracted enough attention. Trace elements are indispensable to the body’s physiological functions and metabolism of substances, which directly affect the body’s growth and development [1,2], especially pregnant women, the content of trace elements in the body of change