佝偻病是儿科的一种常见病、多发病。尤其在北方,由于冬季寒冷时间长达半年之久,造成了婴幼儿户外活动受限,紫外线照射不足;又由于在食物中没有及时添加钙剂和鱼肝油,且缺少富含各种维生素的食物和蔬菜,而6个月内的婴儿生长发育最快,需要维生素D又多,故往往造成婴儿体内维 Rickets is a common pediatric disease, frequently-occurring disease. Especially in the north, due to the winter cold time of up to six months, resulting in limited outdoor activities of infants and young children, inadequate UV exposure; but also in the food is not timely addition of calcium and cod liver oil, and the lack of rich in vitamins and food Vegetables, and within 6 months of the fastest growth of infants, need more vitamin D, it is often caused by the baby in vivo dimension