Salam! Alhamdulillah ramai kat sini still bf sambil pregnant, so you're definitely not alone, a few of us are in the same boat actually. Tentang the cirit-birit, tu bisa jadi dari susu formula change atau something else entirely, so best check dengan paediatrician first to rule out any tummy issues. The sour smell you're noticing in your breastmilk bisa happen during pregnancy sebab hormones berubah, tapi tu doesn't mean it's spoiled or harmful for baby, baby's tummy usually fine je dengan breastmilk dari ibu hamil. Kalau dia still mau bf for sleep, that's actually okay to continue (unless you feel sore or uncomfortable), and many toddlers do taper off naturally as pregnancy goes on. Tapi since he's having frequent loose stools, definitely best to check with his doctor to make sure there's nothing else going on, baru kita cari solution dari situ!