I looked at the CDC's page (https://www.cdc.gov/ncbddd/fasd/alcohol-use.html). It contains a number of very negative effects from drinking alcohol while pregnant. But because the context was birth defects caused by radiation, I was thinking more in terms of visible deformities - which can be caused by radiation, but which are much less significant from alcohol.

Perhaps I was being too limited in my concept of "birth defects" - including for radiation. If the radiation while pregnant (or before) gives the child cancer at five, is that a "birth defect"? Maybe not, in the way I was thinking, but I can see how it might be thought of that way.