LAUSR

demographics, pregnancy complications and delivery characteristics of women exceeding the IOM guidelines (GT20) with those who did not (LT20). Multivariable analysis used a stepwise backwardelimination approach, with covariates with p<0.20 retained in final models. RESULTS: Of 374 women, 144 (39%) gained GT20 and 230 (62%) gained LT20. Women in the GT20 group were less likely to be multiparous and less likely to use tobacco (p<0.05). There was no significant difference in other baseline demographics. Median BMI at delivery (49.2 vs 45.7, p<0.01) and median total weight gain (29lbs vs 9lbs, p < 0.01) were both significantly higher in the GT20 group. Among women who gained GT20, 10.4% had postpartum infectious morbidity compared to 3.0% in the LT20 (p<0.01). Wound infection was also significantly more common in the GT20 group (7.6%vs 2%, p1⁄40.02). After adjustment, women who gained GT20 had a3-fold higher odds of postpartum infectious morbidity (adjusted odds ratio 3.04, 95% confidence interval 1.14, 8.13). CONCLUSION: Women with class III obesity, who gain more weight than the IOM recommends are at increased risk for postpartum infectious morbidity. This further emphasizes the importance of weight gain counseling in this population.