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In China there is.

Im not sure. The best indication I can find is that such identification is seen as unnecessary from a medical viewpoint. Doing a quick search, the only other information I could find on the matter is that not identifying the sex is viewed as standard practice.

To prevent parents from aborting children of the "wrong" gender. It has sadly happened, apparently.

By the time you can tell, you can't have a legal abortion. Black market ultrasound is probably not the limiting factor in illegal abortions in Sweden or Finland.

They can't really tell with 100 % accuracy until birth, but by week 18 they can tell with a very high level of accuracy. And Sweden permits abortions until the end of week 18.