Once every 6 months, with machines whose shielding was much less effective than the ones in use today.
That too was considered appropriate medical use at the time. Now we know better.
While I agree that the statement that sonograms are always unhealthy for the fetus is rather too absolute, especially when some of the conditions diagnosed using sonograms can be treated in utero and save lives, one must take into consideration that it may turn out to be correct. Medicine is called a practice because they haven't gotten it perfect yet.
It may yet turn out that sonograms aren't healthy, or that they are being overused even by diagnosticians, which makes them unhealthy the way Xrays were in the 1950s: too much of a good thing. They are, however, a reasonable alternative to some of the other possibilities.
Off Topic » in reply to Agreed...
When I was a child, I got a full battery of head Xrays with no shielding every time I went to the dentist.
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