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Doctors are stunned over the case of a Brazilian boy, who is one of very few babies ever to be born with a true human tail, reports the New York Post.
Recorded in the Journal of Pediatric Case Surgery Reports, the infant's condition is said to be due to a "rare congenital anomaly".
Explaining further, the Journal describes the tail as "a remnant of the embryonic tail formed between the fourth and eighth week of gestation".
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Typical in infant development during early pregnancy, the embryonic appendage is usually reabsorbed by the growing body to form a tailbone.
However, in the case of the Brazilian newborn, the appendage kept growing, leaving the child with a 30-centimetre tail and a nearly four centimetre-wide ball at the end.
While the growth didn't cause any health complications, the family opted to remove it.
According to the Journal, the Brazilian newborn is one of 40 infants ever to be born with a tail.
Watch the video above for more.
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