Stephen PullingerSarah Capewell's son Jayden lived for two hours but despite her pleas was refused help by doctors at James Paget University Hospital, Gorleston, because he was born at 21 weeks and five days into her pregnancy - two days short of the 22 weeks' gestation limit when intensive care is offered.Stephen Pullinger

Sarah Capewell's son Jayden lived for two hours but despite her pleas was refused help by doctors at James Paget University Hospital, Gorleston, because he was born at 21 weeks and five days into her pregnancy - two days short of the 22 weeks' gestation limit when intensive care is offered.

Today she is taking her crusade for justice for premature babies to London and will be joined on a march from Trafalgar Square to 10 Downing Street by hundreds of supporters from all over the UK in a bid to change medical guidelines.

After what happened in October 2008, Miss Capewell, 23, regularly hears similar heart-breaking stories from women around the world who have got in contact via her website justice4jayden.webs.com

Miss Capewell, of George Street, Yarmouth, who will hand in a petition to the prime minister from 18,000 people who have registered support online, said: 'We want all parents to be given information before their baby's birth about what could happen, what their options are and what the law is.

'We want all babies born alive to be assessed by a paediatrician who can then talk things through with the parents.'

Miss Capewell, backed by Coronation Street actress Kym Marsh who herself suffered a premature baby tragedy, will also be handing in data in support of treating babies younger than 22 weeks.

She is also calling for birth and death certificates to be routinely issued for all babies born alive under 22 weeks. 'That would mean the mother could still take maternity leave and get her life back in order. And it is also a statement saying, 'I am not a miscarriage, I am a baby'. Pictures of Jayden show he was a fully-formed baby,' she said.