please help

my daughter is very constipated and is crying idk what to do.. i tried giving her a bath and i rock her and she just keeps trying to push it out and she also has not pooped today yet .. she is not sleeping that good either because she wakes herself up by moving her legs and turns all red trying to push. her doc said its normal that babies get gassy and constipated but is there anything i can do to prevent this ? shes only 2 weeks old and its awful to watch her struggle like this.. please any advise that worked for ur kids would be highly appriciated