making enough?

Brittni

my son is 2 weeks old and i am breastfeeding him. we had a slow start because he was in the nicu the first week and now im worried that im not producing enough? he breastfeeds exclusively without seeming to need a bottle afterwards, but when i pump in between im only getting about 2 ounces in a bottle. is this enough to be freezing for him for when i go back to work? not sure how much newborns need to eat.