KD,

My little girl would do this exact same thing!!! She would go int he corner some where and hold it in. she would stand there squeezing her hiney so hard so she wouldnt have to go, that she would be sweating. when you asked her if she had to go she would scream NO!!! WE would have to give her stool softener because she would hold it for so long that when it did finally come out it was bigger than adult size.. I know that is gross but it is the truth. More than once she busted blood vessels in her little hiney!!! I took her repeatedy to the dr thinking she had a medical problem....no problems... she finally out grew it but it was tough!!! No sure i really have any suggestions... we treid everything we could think of!! Nothing seemed to help.