两只试管羊健康出生。
该项目跟踪研究了1991年在10个美国城市健康出生的婴儿。
The project follows healthy babies born in 1991 in 10 U. s. cities.
伯恩斯坦博士还说，这项研究之所以强大，不仅是因为它的规模，还因为它考虑到除畸形以外同样影响婴儿健康的因素，如出生体重。
Still, Dr. Bernstein said the study was strong not just because of its size but because it weighed factors other than malformations, such as birth weight, that also affect the health of the baby.
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