Wa'alaikum assalam! Aah normal je tu, jangan worry lah, especially since you're doing mix feeding (BF + formula), poop consistency mmg boleh jadi macam tu, pekat sikit dan berketul-ketul. A few of my mum friends sama jugak, and our pediatrician said as long as baby aktif, tak demam, dan feeding well, semua okey. Tapi kalau baby nampak uncomfortable, konstipasi, or ada blood dalam poop, bagus check dengan doctor ye just to be on the safe side, better peace of mind!