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Human Fertilisation and Embryology Bill [Lords]

My hon. Friend is making a thoughtful speech. The vast majority of premature births are due to maternal factors, not to foetal factors; the foetuses are not sick in those cases. Different definitions of viability exist, and mine might be different from others, but surely it is best to follow the one provided by paediatricians and neonatologists, who devote their lives to dealing with those tiny babies. They are clear about their definition, which is that the viability threshold is the point at which a foetus would have a decent chance—a more than 15 per cent. chance, for example—of surviving outside the woman. That is why they say that there is no evidence of a significant improvement in the survival levels of pre-term infants below 24 weeks' gestation in the past 18 years. The paediatricians say that, and we should follow their advice.