I have had this happen to a couple of people who own the M***** PIS. When the mother is finished pumping she should disconnect her tubing and not roll it into the little compartment where the tubes attach. This allows air to get through and dry out any mositure that collects. Some moms have done that. If any moisture has collected in the tubing, it can because of moms body temp, it will turn to mold eventually. I tell the moms to hang the tubing over a door knob or in the back of a door to be sure it dries out completely. Also she should call Medela and tell them this happened and they will replace the tubing if this is a pump that she purchased. I have had two moms who were able to replace their tubing because of this problem. Darlene Breed, BSN, RN, IBCLC Worcester, MA (USA) ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com or call Juno at (800) 654-JUNO [654-5866]