Raymond...A few questions...I think in an earlier post you said that your wife left the pack on all night and slept till morning. Perhaps that is why it happened because she left it on so long.
Was there a heat source on her as well?
Did she suffer any discomfort from leaving it on all night?
Has the belly reappeared after a few days?
As you can probably tell, there are a few of us here that would like to get rid of that belly bulge that we've had for years after bearing children. We appreciate your input!