How do I wake my newborn to drink milk?

I tried to wake her up and feed her, but she went back to sleep. She only managed to drink about 25ml, even though the doctor told us to feed her 45ml. She doesn’t want to drink. I tried breastfeeding, but she didn’t want it. I expressed my milk and gave it to her, but she drank a little and didn’t want any more before going back to sleep.