Chanita:

     my recollection from a number of conversations with physicians,
anesthesiologists and a neonatologist is that the only fluid that can be
aspirated with out causing pneumonia is BREAST MILK...

      shall i clarify   Breastmilk aspiration does not cause pneumonia.

       When Glass and Wolf presented here ( in Chicago) we had an extensive
conversation with the re" invisible aspiration" they had video's that showed
this and they were adamant that this is something that CAN NOT be detected
any other way.

              Patricia