My son is 12 weeks old. Today is my third day back at work, so I am getting used to pumping and managing my supply when I am not around him all day.

Today, I pumped 8oz at 8:30 when I got to work. My son usually takes 3 x 4oz bottles during the day. (If I don't get home on time, he will need a fourth bottle to tide him over.) So I only need another 4oz for him to have enough milk tomorrow.

Can I simply pump for volume at work? Or do I need to pump at sufficiently short intervals to maintain my supply and prevent a clogged duct or mastitis? If I can get away with just two pumping sessions during the work day, I will be thrilled. But I don't want to cause a problem for my supply either.