Image copyright GoFundMe Image caption The condition occurs once in about 10 million births

Twin boys who were conjoined at the tops of their heads have been separated by a team of surgeons in New York.

Thirteen-month-old Jadon and Anias McDonald underwent 16 hours of surgery, and are now undergoing additional procedures to rebuild their skulls.

On Friday morning, the boys' mother Nicole McDonald wrote on Facebook that she is excited but "aches with the uncertainty of the future".

She also posted a photo of Jadon alone in his own hospital bed.

"I actually asked why they rearranged the room because I hadn't really internalised the idea that there would be two beds in here," Mrs McDonald wrote with the photo, also wishing her son a "happy rebirth day".

Image copyright Facebook Image caption Doctors say the boys will need to be fed with tubes for another week

In an earlier post, Nicole wrote: "It's a bit surreal to sit here and type this... I should feel so happy... TWO SEPARATE BABIES!!!...and yet I ache with the uncertainty of the future."

The boys were born with shared blood vessels and brain tissues, a very rare condition that occurs once in about 10 million births, doctors say.

Dr James Goodrich, who has performed similar operations for other children including two Syrian twins earlier this year, prepared for the operation by creating 3D models of the attached heads.

CNN's Sanjay Gupta, who witnessed the surgery, says that 80% of similar twins die if they have not been separated before the age of two.

The McDonald family moved house with their two-year-old son and twin boys from Chicago to New York to be closer to Montefiore hospital.

The family has raised more than $100,000 for the costs of surgery.</s>NEW YORK — Forty medical experts at a New York hospital have worked for 20 hours to successfully separate conjoined twins attached at the head.

Officials at Brooklyn's Montefiore Medical Center say 13-month-old boys Jadon and Anias McDonald are recovering after the marathon procedure, which ended Friday before dawn.

Hospital officials say the twins have "a long road of recovery and rehabilitation ahead of them."

The twins' mother, Nicole McDonald, posted a picture of the first twin on Facebook while the second was still undergoing surgery. She said the atmosphere at the hospital is "one of celebration mixed with uncertainty."
Surgeons separate craniopagus conjoined twin boys in New York City.