Swiss doctors said Sunday that they had successfully separated conjoined twins only eight days after birth, adding that they were possibly the tiniest patients that have ever undergone such a surgery.
The girls weighed a total of 2.2 kilogrammes at the time of the five-hour operation at Bern University Hospital on December 10.
They were part of triplets who were born in December, two months ahead of their due date.
While one sister was born healthy, the other two were joined at their chests, livers and hearts.
The parents and the doctors decided to separate the girls so soon after birth because the joined liver created serious blood pressure problems in both babies.