A baby girl in Hong Kong was born pregnant with twin fetuses, a condition known as fetus-in-fetu. It is an incredibly rare phenomenon, and occurs in only about 1 in every 500,000 births and it is not clear exactly why it happens. The World Health Organization (WHO) considered a tiny fetus found within an infant to be a kind of teratoma, or tumor, rather than a normally developing fetus. But the doctors who treated the baby girl wrote, "Rather than a teratoma, the ...
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