LO milk intake

Hi! LO is currently around 2 weeks old and each time we feed her when she is hungry (hunger cues) she will only drink 20ml to 30ml and then doze off to sleep. She would then wake up again maybe another hour for milk and drank 10ml to 20ml before dozing off again. Previously she can drink up to 60ml to 90ml at one shot.. anyone encounter such situation? Note: LO has jaundice but her jaundice level has dropped. LO on BM.