When the baby was born, doctors scanned his stomach to find his twin inside. Photo / SWNS
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A baby boy has been born "pregnant" with his own twin brother.
Doctors discovered the half-formed male baby - complete with a brain, arm and legs - behind the otherwise-healthy baby boy's stomach after he was born.
They successfully operated to remove the 7cm mass, which they suspect was a rare "foetus in fetu" twin pregnancy - one of around 200 ever recorded in the world.
Radiologist Dr Bhavna Thorat, who spotted the problem during a routine scan, said: "It was inside a fetal sac of the newborn."
Dr Thorat said: "I could see bones of the upper and lower limbs of the fetus.
"The unique thing about it was I could see a tiny head with the brain inside.
"However, this parasitic twin didn't have a skull bone."
The newborn was taken to Titan Hospital in Thane for surgery to remove the 150g mass. Dr. Nichlani added: "The baby is now doing extremely well and the mother will begin feeding him soon."
Gynecologist Dr Neena Nichlani said: "It is a case of monozygotic twin pregnancy sharing single placenta, where one fetus wraps itself around and envelops the other and robs the host of its nutrition.
"It can be implanted in [the] skull, abdomen or tail bone of the host.
"Sometimes it can also lead to the death of the host because both get nutrition from a single cord."
Dr Nichlani said the baby has been sent for further testing, reports are awaited.