他举例说，一个低出生体重婴儿长大后很可能会身材矮小。
For instance, he says, a low-birth-weight baby is likely to grow up short, he says.
但有一个存在的问题是，有很多试管婴儿都有低出生体重的问题。
One source of worry is that so many IVF babies have low birth weight.
但有一个存在的问题是，有很多试管婴儿都有低出生体重的问题。
One source of worry is that so many IVF babies have low birth weight.
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