The Prime Minster has indicated he will vote against a bid to lower the 24-week time limit on abortions.
Gordon Brown made his position clear when he said the bid to lower the legal limit was not backed by scientific evidence.
MPs are to be given a free vote on the highly-contentious issue next week when amendments demanding the limit be cut it to 20 weeks or less tagged on to embryology legislation by pro-life MPs are debated.
The Prime Minister said: "The BMA published a report only a few weeks ago saying there was no improvement in the survival rate before 24 weeks."
"If the medical evidence is telling me there has been no improvement ... then I think the original position of the House of Commons on 24 weeks is, on a free vote that I will engage in, the one I want to uphold."
The Prime Minister's comments come as research published by the Christian Institute claimed that three in four women back the 20-week limit.
Colin Hart, director of the institute said: "We have one of Europe's latest cut-off points for social abortion. Two thirds of EU countries fix their limit below ours, with most banning abortion for social reasons after 12 weeks' gestation."
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