One way to obscure the face is, if you're not trying to illustrate facial features of certain genetic conditions, to crop the face out entirely.
Also, I think the concern is more "Are the parents of the kids aware that the picture is on Wikipedia and are they okay with it?", and not copyright. I know people with genetic syndromes, along with some doctors and a lot of parents of kids with genetic syndromes, have issues with some of the medical imagery used to portray genetic conditions.
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