i know this may mean nothing.
but when my DD did that it was due to wind.
i foudn out she was holding on to her wind and it was the formula i was using.
also when did she last poo? and what was it like?
tay used to have really green poos when she was screaming heaps from tummy wind pain.

try a bottle of water maybe.
i dont know. wish i could help some more.