A young woman from Vernon, British Columbia, on Wednesday delivered rare twin girls conjoined at the head. The British Columbia Women's Hospital in Vancouver where the babies were born said both the girls as well as their mother are doing fine.

A team of 16 doctors and nurses on Wednesday, successfully performed a delicate cesarean operation on Felicia Simms, the 21-year-old mother of the twins who were "wiggly, vigorous and very vocal," according to a hospital spokesperson.

The twins- Krista and Tatiana - weighing a total of 12 pounds, 10 ounces and of equal size and length were born with the top of their heads fused. A test conducted prior to their birth showed that the babies share two lobes of the brain, but have separate stems.

Doctors said they were trying to ascertain how much of their brains the babies share, adding that both the girls interact closely to physical stimuli.

They said it could be three or four months before they will know if the girls can be safely separated.

Medical experts have said that being joined at the top of the head is rare even for conjoined twins.

Doctors said the family faces an almost unique dilemma over the choice on whether to separate the girls even if separation proves medically possible.

Conjoined twins are extremely rare, occurring in as few as one in every 200,000 births, with those fused at the head even rarer making up only 4 percent of the total conjoined births.