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The doctor described the medical case as "very rare," adding that only about 70 such cases have been reported worldwide.

Naseer said there were several theories explaining this phenomenon, but that the "most acceptable one is that the fetus was a twin of the baby. But as a result of an abnormality during the development process, the fetus was probably contained (absorbed) inside the belly of the other."

The condition, called fetus in fetu, often results in a calcified mass and can be mistaken at first for a tumor. But in some cases, the absorbed twin retains a discernable shape with head and developing limbs, hair or even facial features.