UNIVERSITY OF BRISTOL
Media release
Caesareans could make it more difficult to have other children

Women having their babies by caesarean section could find it harder to become pregnant later, a study has found. Researchers in Bristol have discovered that once women have had a caesarean and then try to get pregnant again, the risk of it taking more than a year to conceive another baby increases.

The seven thousand women were all part of the Avon Longitudinal Study of Parents and Children (ALSPAC), popularly known as Children of the 90s, which has monitored the health and development of over 14,000 families since the early 1990s.

The research from the Bristol University study, published today in the journal Human Reproduction, found that when women who had previously had a caesarean tried to get pregnant again there was almost double the risk of it taking longer than a year. The risk following caesarean section was 12% compared to 7% for women with no previous caesarean.

The increased risk remained significant even taking into account such important additional factors such as the ages of both mother and father, how long they had lived together, oral contraceptive pill use, cigarette exposure, alcohol consumption, educational level and ethnicity.

The rate of caesarean section has risen nationally threefold in the past 25 years without any evidence of improved outcomes for the mother or baby. One in five women having babies in the United Kingdom is now delivered by caesarean section. Little attention has been paid to whether there is any relationship between caesarean section and subsequent infertility.

Research scientist Dr Deirdre Murphy from the Obstetrics and Gynaecology Division of the University of Bristol says "We looked at the delayed ability to conceive of women who did eventually go on to get pregnant. This may be underestimating the true magnitude of the association. It is possible that some women will choose not to have a further pregnancy because of the trauma of a section or will fail to achieve any further pregnancy following caesarean section. "

"Further studies in other populations are needed to confirm our finding that caesarean section may have a negative influence on future fertility," she adds. "Reliable evidence on long-term consequences of caesarean section is essential, if women are to be offered informed choice with regards to mode of delivery when they have their babies."

The relationship between caesarean section and subfertility in a population-based sample of 14,541 pregnancies by DJ Murphy MD MRCOG, Division of Obstetrics and Gynaecology, University of Bristol. Also, GM Stirrat MD FRCOG Division of Obstetrics and Gynaecology, University of Bristol and J Heron PhD Division of Paediatric and Perinatal Epidemiology, University of Bristol and the ALSPAC Study Team.

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Copyright: 2001 The University of Bristol, UK
Updated: Tuesday, 02-Jul-2002 10:03:14 BST