Eh, 8 hari without poop is quite long even for breastfed babies lah, normally they can go a few days but 8 days is on the borderline! Since your baby's pee is normal and he seems okay, I'd suggest getting him checked with the paediatrician just to be safe, better to rule out any issues like tongue tie affecting his latch or milk intake. A few of my mum friends had babies who went long stretches without pooing but turned out the latch wasn't quite right, so worth confirming everything is fine la.