Power pumping timings

kriz

So my milk supply has deceased significantly and found that power pumping helps gets it going again so I started today I pumped 4 oz normally waited like 10 15 mins and got 3oz more now can I power pump every time my newborn wants a feeding or I can only power pump once a day everyday? If you know please let me know I have gave him formula and I just feel so guilty since he's almost 3 weeks old and I want to bf as much as I can