In a study of over 300 women with inflammatory bowel disease who reported at least one pregnancy after their IBD diagnosis, more than half reported that their disease symptoms improved during pregnancy, while about 20% said that their disease symptoms were worse during pregnancy. Younger women and women with ulcerative colitis were more likely to have increased disease symptoms during pregnancy. Of the nearly 200 women who breastfed, 14% said that symptoms improved, 13% said symptoms got worse and about 40% said their symptoms did not change during breastfeeding Those with worsening symptoms during breastfeeding were younger and had a lower body mass index than those whose symptoms remained the same or improved.