9 wks baby sleeping more, drinking less

My 9 wks old baby is only drinking 300-400ml a day (24hrs). She is only drinking approx 60-80ml per feed. She still get wet diapers and poo within the day. At least 6-10 times of diaper changeout. However, she seems to be drinking lesser than what she should. Should i be worried? She sleeps more and she slept from 8:40pm up till 1.38am and is still not awake for her feed. Should i be waking her up for feed?