How often should I wake my baby to feed?

FTM here and I’ve still got lots of questions. My milk just came in yesterday and I am pumping all the time. My baby would have slept through the night if she could have but I know you need to wake them up to feed. How often should I be doing this? She drinks about 2-2 1/2 ounces at a time, and is 4 days old.