Aww sayang, sakit perut yang selalu macam tu kena check dengan doktor cepat-cepat ya, especially kalau dah lama atau ada symptoms lain macam demam, muntah, atau poop changes, better safe than sorry lah. A few of my mum friends pernah alami and macam-macam je punca dia, dari food sensitivity, constipation, ataupun something yang kena monitor, so best get it checked to be sure what's going on with your little one.