How many ounces of breastmilk does your baby drink?

Alex • Ftm to my little prince👶🏾💙. So blessed!
FTM..My son is 3 weeks old and i've been breastfeeding and pumping. I let him nurse and give him about 3oz of pumped milk every 3hrs.  Is this enough? When will i know to increase to 3.5 ounces?