HOW long should a woman who has had a miscarriage wait before trying to conceive again? The World Health Organization suggests six months, but it seems women might be better off trying again as soon as they want to.

The WHO guidance is based on a South American study that found more adverse outcomes in women who conceive early. Now Sohinee Bhattacharya at the University of Aberdeen, UK, and colleagues have analysed Scottish hospital records of 30,000 women who miscarried between 1981 and 2000. Those who became pregnant again within six months were less likely to experience another miscarriage …