It is nearly impossible to stretch your pouch. It is made of the upper part of the stomach and this tissue is not readily stretchable. That is one of the reasons that section of stomach was chosen. It didn't used to always be so. But, as the surgery was perfected, that was one of the changes made.
Now, having said that, the stomach will GROW. This is part of the body's adaptability. The body cannot possibly survive, long term, on the small amounts of food we can consume in the immediate post-op period.
You can, however, stretch your stoma. That is the surgical connection between the pouch and small intestine.
RIP, MOM ~ 5/31/1944 - 5/11/2010
RIP, DADDY ~ 9/2/1934 - 1/25/2012