Aww mama, I totally understand your worry, seeing darah in baby's nappies is really scary! Please do follow up with your paediatrician closely on this, especially since it's been on-and-off even after stopping FM. The weight gain (100g in a month) is something your doc should be monitoring closely too, so jangan delay the lactose-free formula trial. A few of my mum friends had similar situations and their babies did improve once they switched, tapi setiap baby lain, so kena follow doc's advice la. The good news is your baby is aktif, that's a positive sign. But with recurring blood in stool even on full BF, this really needs your paediatrician's eyes on it regularly, not just home monitoring. If the bleeding gets worse or baby becomes lethargic, jangan tunggu, go to emergency okay? You're doing the right thing by being proactive. Hang in there, mama!