Over 2 million pregnancies of the period 1995 to 2000 were evaluated from the German Perinatal Database. “Previous interruptions, miscarriages and IUFD are relevant risk factors for prematurity and are related with low birth weight of the new borns. Pregnant women with such risk factors have to been considered as risk pregnancies and need intensive surveillance". The study found that for a woman with one prior abortion, very pre-term birth (under 32-34 weeks' gestation) risk is boosted by 30%, while more than one prior abortion increases relative very pre-term birth risk by 90%.

Zeitschrift für Geburtshilfe und Neonatologie 2008

Voigt M, Olbertz D, Fusch C, Krafczyk D, Briese V, Schneider KT. “The influence of previous pregnancy terminations, miscarriages and still-births on the incidence of babies with low birth weight and premature births as well as a somatic classification of newborns” [Article in German], Zeitschrift für Geburtshilfe und Neonatologie (2008) Feb;212(1):5-12.