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Lawmakers were considering a reduction in the 24-week time limit.

Associated Press

LONDON - Human fetuses cannot feel pain before the age of 24 weeks, a British medical association said Friday - delivering a setback for antiabortion activists campaigning to lower the country's 24-week time limit.

Lawmakers who were considering lowering the limit to 20-22 weeks had commissioned the study by the Royal College of Obstetricians and Gynecologists.

Citing evidence from medical research and post-mortem reports, the group said nerve connections in the brain were not sufficiently formed to allow pain perception until after 24 weeks, and that even then, the fetus was in a state of sleep-like unconsciousness or sedation.

"There was fairly good evidence that the pathways necessary to feel pain really just aren't there before 24 weeks - although they very clearly are there after," said Richard Anderson, a professor in human reproductive sciences with the University of Edinburgh, who was part of the study.

Some doctors disagree with the findings, arguing that fetuses can experience distress by the age of 20 weeks. In the United States, Nebraska recently passed a bill banning abortion at and after 20 weeks of pregnancy.

But the American College of Obstetricians and Gynecologists has said it knows of no legitimate evidence that shows a fetus can experience pain. It said a fetus' brain begins its final stage of development between the 20th and 40th weeks of pregnancy, and that certain hormones that develop in the final trimester also must be present for it to feel pain. It's not known exactly when those hormones appear.

In Britain, the Abortion Act of 1967 allows surgical abortions up to 24 weeks. A woman can still abort after 24 weeks if doctors agree the mother's life is in danger or there is strong evidence that the fetus would be born with a severe disability.

The law, however, does not extend to religiously conservative Northern Ireland, where abortions are still banned unless a woman's life is in danger or at mental or physical risk. As a result, an estimated 1,400-2,000 Northern Irish women travel annually to England or other European Union nations to end their pregnancies.

"We have no real evidence because the unborn baby can't speak," said Bernie Smyth, director of Precious Life, an antiabortion group active in both Northern Ireland and the Republic of Ireland. "The fact is babies have been born at 24 weeks, they have survived, and they do feel pain."

Prime Minister David Cameron had backed reducing the limit to between 20 and 22 weeks before he came to power in May. Cameron's office issued a statement Friday saying no changes were planned in the policy.