After an abortion your risk of  a preterm delivery of your first wanted child goes up. Posted here, but it’s subscriber access only. I’ve copied part here:

Dr. Ghislain Hardy, a third-year resident in the department of obstetrics and gynecology at McGill University did a retrospective chart review of women who had delivered a baby between 2001 and 2005 at the Royal Victoria Hospital. Among the 17, 916 women who had a singleton delivery, 2,276 (13%) also had undergone a previous abortion and 862 (5%) had two or more induced abortions.

After adjusting for baseline characteristics, women with one previous abortion were 45% more likely to have a premature child at under 32 weeks; 71% more likely at less than 28 weeks; and more than twice as likely at less than 26 weeks. This association was even stronger for those with two or more abortions. “Preterm birth is a major concern in our health-care system today. It is the most important cause of neonatal morbidity,” said Dr. Hardy in his presentation. The rate of preterm birth is on the rise in Canada, and was more than 8.1% in 2006. Preterm birth is a burden on neonatal intensive care units, and these children go on to have health and social problems.

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