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A mum has celebrated the arrival of the UK's most premature twins - who were given zero per cent chance of survival.See SWNS story SWSYtwins. A mum has celebrated the arrival of the UK's most premature twins - who were given zero per cent chance of survival. Little Harley and Harry Crane were conceived via IVF and were born at 22 weeks and five days - more than a week before the abortion limit.Babies born at 22 weeks are not classed as legally viable and medical intervention is sometimes not offered. But the tough siblings weren't going anywhere and have amazed doctors - who initially gave them a zero per cent chance of survival.