Smith CJF, et al. - This prospective cohort study of pregnant women with rheumatoid arthritis (RA), juvenile idiopathic arthritis (JIA), or healthier comparison women was aimed at analyzing the independent impacts of maternal disease activity, drug use, and comorbid pregnancy conditions on the risk of preterm delivery (PTD). A total of 657 women with RA, 170 women with JIA and 564 comparison women without the autoimmune disease who delivered live born infants were included for analysis between 2004 and 2017. Investigators found that RA women and JIA women were at increased risk for PTD. Maternal disease activity and the use of corticosteroids can lead to some of this excess risk.