丹麦哥本哈根大学国家教学研究医院的医生安雅·平博格领导的研究小组研究了1995年至2006年间使用冷冻胚胎生产出的1200名婴儿的资料,同时也比较了17857名自然受精的胎儿的资料。结果发现,由冷冻胚胎经过发育生产出的胎儿通常体重较大,平均多出200克,发生早产、畸形的概率较小。由冷冻胚胎发育后生产的孩子中,产生双胞胎或者三胞胎的比例仅为14.2%,而自然受精生产出的 A team led by Ana Pingbo, a doctor at the National Teaching and Research Hospital at the University of Copenhagen in Denmark, studied data on 1,200 infants born from frozen embryos between 1995 and 2006 and also compared 17,857 fertilized fetuses. The results showed that the fetus produced by the development of frozen embryos usually weigh more, an average of more than 200 grams, the probability of premature delivery, deformity smaller. Of the children born after the development of frozen embryos, only 14.2% of the twins or triplets were born, whereas those produced by natural fertilization