In the United States, 59% of women of reproductive age (20-39 years of age) are either overweight or obese (defined as body mass index (BMI) ≥ 25 kg/m2). Almost a third of women in this age group are obese (BMI ≥ 30 kg/m2). Among women delivering live born infants in 20 states in 2009, pre-pregnancy obesity prevalence was estimated at over 20%. The prevalence of pre-pregnancy obesity in these 20 states displayed an increasing trend between 2003 and 2009. This is of concern since obesity is associated with an increased risk of preeclampsia, gestational diabetes, congenital anomalies, stillbirths and other adverse birth outcomes. In addition to pre-pregnancy BMI, Gestational Weight Gain (GWG) may also influence pregnancy and birth-related outcomes. In 2009, the Institute of Medicine (IOM) released revised guidelines for appropriate GWG based on pre-pregnancy BMI. Preliminary estimates from births during 2010 indicate that nearly half of women have GWG in excess of these recommendations. For more information, regarding the article, kindly go through the above link.