Alah, 18 hari baru lagi, jangan worry sangat, poop dia memang macam tu dulu, especially kalau breastfeeding, kuning keras sikit adalah normal! A few of my mum friends said their babies poop keras jugak awal-awal, tapi it settled down after a few weeks as their system adjust. Since you've already seen the doctor untuk the kahak, boleh tanya dia jugak about the poop consistency, sometimes babies just need a bit more time, atau kadang they're not getting enough milk latch-wise, so worth double-checking. Meantime, ensure baby latching properly and frequent feeds (on demand) usually helps soften things naturally, but your doctor is the best one to guide you on this one, ok?