Catherine, thanks...good info. I kept it for my files. Thanks! Kathleen > Human babies use mainly compression to extract milk from the breast, >they use negative pressure mainly to keep the teat (nipple and areola) in >their mouths. >Hope this clarifies the pressure issue. >Catherine Watson Genna, IBCLC > ********************************************************************* Kathleen B. Bruce RN, BSN, IBCLC (email = [log in to unmask]) "All truth goes through three stages. First it is ridiculed. Then it is violently opposed. Finally, it is accepted as self-evident." Schoepenhouer **********************************************************************