Formula/Breast feeding

Ko

My baby boy is 1 week and 2 days old. I’m having trouble breast feeding, when I breast feed him he eats for almost a whole hour! I don’t think I’m producing enough milk, I pump every 2-3 hours and only get 1 oz every time, so I have been switching it up and giving him Earth’s best Organic Formula, then giving him my breast milk as well when I have enough from pumping. Anyone else do this? Is it okay to be using both? I’m just not producing enough milk to get him full but really want to keep breast feeding as I know it’s the best for him.