Hindi pa kailanman normal yun, mommy, usually dapat araw-araw or every other day ang poop ng 4-month-old, lalo na kung exclusively breastfed pa. A few of us here had the same concern, at ang common culprit is either constipation or something sa diet (if may solids na, or if formula, baka need ng adjustment). I'd really suggest checking with your pedia to make sure walang blockage o digestive issue, kasi kung stretch na ang 2-3 days like yan regularly, dapat may intervention na. Pano naman ang baby mo otherwise, okay lang ang energy at belly, walang signs ng pain?