Jan- This was a study which could only show ASSOCIATION NOT CAUSE!!! This is the first important point. (Lust KD, Brown JE, Thomas W. Maternal intake of cruciferous vegetables and other foods and colic symptoms in exclusively breast-fed infants. J Am Diet Assoc 1996;1:46-48). The second is that even though we don't have proff of how the association occurs, it is certainly not gas passing from the mothers' GI tract into her blood and into milk! A few possibilities exist in the paper---, there are at least 2 compounds present in cruciferous vegetables which MIGHT cause colic symptoms- s-methyl-cystein sufloxide and singrin. When s-methyl-cystein sulfoxide is heated in the presence of acid, the result is 2 volatile compounds, dimethyl disulfide and hydrogen sulfide.