'Unnecessary' deaths due to lack of contraception
10 July 2012 Last updated at 16:21 BST
Research published by The Lancet suggests providing more contraception around the world could save 100,000 lives every year, by stopping many women from dying in childbirth.
An international meeting in London is due to give details on funding for contraception in developing countries.
Jane Dreaper reports.
Contributors in this piece:
Professor John Cleland, London School of Hygiene and Tropical Medicine