当孩子降生的时候 when a child is born
当孩子降生时
When the baby is born
以上为机器翻译结果，长、整句建议使用 人工翻译 。
他们甚至也不知道这些孩子们的父亲是否当着孕妇吸烟，或者当孩子降生后，当他们的大脑还处于发育期时，双亲中是否有人吸烟。
They also didn't know which fathers smoked while the children were in the womb, or if either parent smoked after the babies were born, when their brains would still have been developing.
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