Eh normal je sayang, baby poop mcm berminyk especially masa early weeks pa sebab dia mostly susu je, lagi-lagi kalau mix feeding macam baby ko, FM pun ada, ASI pun ada, so texture dia memang berbeza sikit dan oily. 38 hari pa baru, so jangan risau la, ni tahap normal je! Kalau colour dia kuning bright atau ada mucus/busa sangat baru kena perhatikan, tapi based on what you're describing sounds fine je. A few of my mum friends pun same experience masa babies depa mixing bottles and breast, terutama first few weeks. Keep an eye je la, but if you're worried about anything else like frequency or dia uncomfortable, boleh la check dengan paediatrician just to be sure!