Monoclonal antibody directed against TNF (tumoral necrosis factor) that is used for treatment of autoimmune diseases like Rheumatoid Arthritis and Crohn's Disease. Probably because of a high molecular weight, no detectable traces have been found in mother's milk. It is not absorbed by the gut which is even more protective for the nursing infant. No harm effect has been shown among breastfed infants whose mothers were treated with this medication. Avoid using it in the two post-partum weeks since significant excretion into the milk within the first 3 - 4 days after delivery and absorption by the infant is possible.