"Spontaneous miscarriage affects 12–15% of all pregnancies ( Zinman et al ., 1996 ). Eighty percent of miscarriages occur before 12 weeks of gestation, and the majority are due to chromosomal abnormalities (Harlap et al ., 1980). Our figures from this study population are consistent with previously published data. The risk of miscarriage after the detection of a fetal heart on ultrasound scan is reduced to 5%, except in patients who have had recurrent miscarriages ( van Leeuwen et al, 1993 ). Many factors have been described to increase the risk of spontaneous miscarriage; however, obesity was not found to be a risk factor by Risch et al . (1990). Recent evidence indicated that obese women undergoing infertility treatment were at increased risk of spontaneous miscarriage ( Hamilton‐Fairley et al, 1992; Wang et al, 2000 ). However, this point has also been controversial (Lashen et al, 1999; Roth et al., 2003 )."