my mother in law started teaching my boy when he was 4+months the command 'she-she' = pee, 'ng-ng' = shit. so whenever before change diaper, we'll say she-she, then he'll pee. then 'ng-ng' in morning, then he'll shit. now my mother in law try to potty train him. but he still dont know how to tell us he want pee or shit.