The baby’s condition was later known as fetus-in-fetu, which is incredibly rare and occurs only in about 1 in every 500,000 births.
The World Health Organization considers 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 that rather than a teratoma, the tiny fetuses may instead be the remains of sibling twins that were absorbed during the pregnancy.
During surgery, which was done when the girl was about 3 weeks old, the surgeons discovered two fetuses between her liver and her kidney. One fetus weighed 0.3 ounces (9.3 grams) and the other 0.5 ounces (14.2 grams) — corresponding to about 8 and 10 weeks’ gestation, the case report said.
Each of the babies had an umbilical cord that linked to a placenta-like mass in the girl’s belly.
The baby girl was obviously too young to have conceived the fetuses herself. Instead, it’s likely that the girl was once one of triplets, the researchers said.
Source: Medical Daily