The briefing paper points to high profile cases of babies surviving below 24 weeks, including Manchester's Millie McDonagh, born at 22 weeks, and the world's most premature baby, Amillia Taylor, who was born a week younger, both in October 2006.
High resolution 3D ultrasound images, pioneered by Professor Stuart Campbell, have shown babies in amazing detail 'walking', yawning, stretching and sucking their thumbs in the womb
The briefing paper also details recent research, including that by Professor Sunny Anand from the University of Arkansas, showing that foetuses are well enough developed to feel pain down to 18 weeks gestation.
She will also unveil a new website (www.the20weekscampaign.org) dedicated to maximising public and parliamentary support for a sensible updating of the law, bringing it into line with advances wrought by modern medical science.
Ms Dorries, who plans to table an amendment to the HFE Bill reducing the limit to 20 weeks, will say: "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.
"No one envisaged such a tally when abortion was legalised 40 years ago. There were 86,000 abortions a year in 1970. 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."
Dr Argent, a former medical director of the British Pregnancy Advisory Service, who carries out abortions, will say: "I fully support and I am right behind Nadine's 20 week campaign. I support a woman's right to choose but I consider that this should be balanced by the majority public view about the unborn child."
