A woman who is one of the rarest types of twins in the world says she is grateful to be alive after doctors gave her and her sister a one per cent chance of survival.

Hope and her sister, Faith Baxter, both 24, are Momo twins - monochorionic monoamniotic - identical twins who share a placenta and amniotic sac.

Doctors told their parents that if they went to full term there was a chance one of the twins would not survive so they decided to induce them two months early.

The twins spent six weeks in the NICU and were given a one per cent chance of survival.

Hope said it was a "miracle" that both of them are alive and thank their parents every day for their decision to have them induced.