Obesity is also believed to adversely influence lipid metabolism, oxidative stress, and neonatal outcomes in pregnancy. Therefore, we plan to compare these parameters in obese active and obese inactive pregnant women. This study design will allow us to compare groups in order to determine if unfavorable maternal lipid metabolism and oxidative stress profiles, and neonatal metabolic outcomes (adiposity and insulin resistance) are more attributable to physical inactivity or obesity. Previous research with non-gravid adults suggests that the presence of comorbidity is more correlated with physical activity levels than with body weight (Blair 1989, 1999, Sui 2007). This finding is contrary to much of the previous literature on pregnancy which suggests "obesity may be the most common health risk for the developing fetus" (Heerwagen 2010). Knowledge about maternal lipid metabolism and oxidative stress profiles and their relationships in neonatal outcomes in active and inactive pregnant women can guide lifestyle and medical interventions designed to target factors that may be contributing to poor outcomes in obese pregnancy. Currently, we have collected data on lean, inactive pregnant women that can be used for comparison at the end of all data collection.