Stock Pile

FTM here! Baby girl is 3weeks old, and I’m really struggling with exclusively pumping. How do you ladies build a stock pile? I’m pumping every three hours, but when I pump my LO ends up just eating it, and I can’t seem to get ahead.

Like to add, my LO is eating 4ounces, and I’m really only pumping 3 ounces total, so essentially shes drinking more than I’m getting out.

Any tips/tricks? Anything?