Pumping

I’m 2w pp today

I have been pumping twice a day but hardly yield 40ml per session

But wen baby suckles I see milk flowing sometimes even leaking then why m I getting so little wen I pump

Baby is on breast milk and formula she’s premie so having difficulty to latch we are taking it day by day and it’s definitely getting better

Slowly will stop formula for now it’s come from 5 times a day to twice a day

I use the spectra s9 pump wondering if I’m doing anything wrong while pumping