Hello, I recall a speaker at a recent video conference stating that the one of the physical differences noted between feeding at the breast Vs. feeding at a bottle was "discovered" by radiologists. The infants drank the dye needed for their exams either by bottle or with the aide of a supplement feeder while nursing at the breast. The radio-opaque dye was actually seen in the ear canals of the bottle-feeders but not the breastfeeders. I'm not sure how accurate this is but if it sounds right, please post any references to it. It was a causual story by the speaker during the Q & A call in time so there was nothing about it in the packet. Thanks! Maureen