A baby born without an anus was 13 hours old before doctors noticed something was wrong with her.
The girl, who was born to a 22-year-old first time mother, weighed 5lbs (2.3kg) and appeared to be healthy.
But more than a dozen hours after the birth, her mother realised she was both urinating and defecating through the same hole.
A closer examination by the doctors revealed that she in fact had no anal opening – anal defects occur in around one in 5,000 babies.
Doctors at the Armed Forces Medical College in the city of Pune, India – about 93miles (150km) south-east of Mumbai – revealed the baby’s condition.
In a medical case report they wrote that the condition ‘was initially missed because of cursory examination at birth and the gluteal fold not adequately stretched to look for anorectal malformation’.
There had been no signs before the birth that anything might be wrong with the baby, and the mother was in good health.
Doctors said they had examined the anus and found it to be ‘apparently normal’ shortly after the labour.
But they had not noticed the deformity, which they later discovered was ‘entirely covered by hyper pigmented [darkened] skin’.
Scans showed the girl did have a normal rectum but skin had grown over the opening and a channel had developed between the bowel and the vagina.
This meant that faeces was travelling through the channel, known as a fistula, and being excreted out of a different hole to the rectum.
The doctors did not find any underlying genetic conditions which could be responsible for the deformity the girl had developed.
In many cases the cause of deformities like this are not clear – it caused by the cells which make up genitals and anus not separating properly while a baby is in the womb.
Surgeons can usually repair the condition by creating an anus during an operation and connecting it to the bowel so it functions normally.
The medics had not operated at the time they wrote the case report but said they would operate to give her a colostomy bag and then later repair the deformity.
The report was published in the Medical Journal Armed Forces India.