Twins conjoined at the head who will never be separated are surviving years beyond what doctors predicted.

Neev and Nelly Kolestein, from Amsterdam, have been attached by the backs of their heads for their 18 years of life, but have their own brains and bodies.

Their mother, who does not want to be identified, was told during labour that her babies would be joined at the head.

Medics were convinced the girls would die shortly after birth, and if they survived, it was expected their life would be a struggle before dying around the age of 10.