I read the study in the Telegraph and wasn't convinced - I'll try and post it later if I can find it again - tbh, giving rats doses of anything, drugs or U/Ss, that would be huge even in humans then analysing the effects doesn't mean that (a) small human doses will do the same or even (b) rat and human morphology are similar enough for a similar thing to happen. One friend had 2 high-risk pregnancies and had lots of scans and her girls are fine, although I'm happy just to have 3 scans (dating, NT scan and abnormality scan).
That's only the latest research quoted and certainly rats do not equate to humans, but they are mammals. There are some Scandinavian epidemiological studies that show various links to left-handedness and other suggestions of changes to brain development, but most of these findings have not been replicated and thus are not widely reported, although a search of the Cochrane Database will allow you to find these studies.
It still suggests to me that caution and moderation is a useful approach in birth, especially in relation to a technology not proven to be safe.
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