Campaigners will demand a "less casual approach" to abortion on Tuesday as they bid to reduce the upper limit from 24 to 20 weeks.
Medical experts and parliamentarians are to warn that action is needed to stop Britain becoming the "abortion capital of the world".
The Government and the British Medical Association (BMA) have rejected calls for the time restrictions to be tightened, insisting such a move was not backed by scientific evidence.
But Nadine Dorries, Tory MP for Mid Bedfordshire, will tell a launch event in Westminster: "Britain has 200,000 abortions a year, or 600 a day. That is just too many - we must slow down on abortion.
"I respect a woman's right to choose. But we are close to being the abortion capital of the world and it is now time to adopt a more moderate, commonsense approach to abortion."
She will insist that the figures are far higher than envisaged when the procedure was legalised 40 years ago, and say medical advances mean more and more premature babies can survive.
"Abortion is now being used as a form of contraception. It is time to send a new signal about abortion, a less casual message, bringing Britain into line with the rest of Europe."
"With an increasing number of babies surviving at 24 weeks or below, we now have the absurd situation where doctors are battling to save premature babies in one part of the hospital and ending life in another part at exactly the same point of gestation."
Ms Dorries is tabling an amendment to the Human Fertilisation and Embryology Bill that would reduce the upper limit to 20 weeks.
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Joining her at the launch will be consultant obstetrician and gynaecologist Dr Vincent Argent and Dr Peter Saunders, general secretary of the Christian Medical Fellowship.
