This sheet is about exposure to infliximab in a pregnancy and while breastfeeding. This information should not take the place of medical care and advice from your healthcare providers. What is infliximab? Infliximab is a medication used to treat autoimmune diseases such as rheumatoid arthritis, psoriasis, psoriatic arthritis, ankylosing spondylitis, Crohn’s disease, and ulcerative colitis. For more information, please see the MotherToBaby fact sheets on rheumatoid arthritis …