Qq so my baby is 4 weeks now and I've been feeding him on demand when he's Hungry so I don't even know how many hours u know ? But I'm going back to work on the 16th so I got an breast pump. I'm trying to see how this work?? Like I know he would have to have 2oz... Right ?? So like Monday -Friday I'm gone for 6 hours .. So how many ounces ? How many ounces in how many bottles will he need? How many hours should he be feed ? Every two hours?? This is new to me . Help!