Increase milk supply

Ba

Help ladies I’m feeling so discouraged! My daughter is 3 days old and I have been supplementing her feeding with formula from time to time because she is never full with just the breast milk....I literally fed ok demand off and on for about 3 hrs today and she never stayed full.... the minute I gave her some formula she is sound asleep and satisfied.

I know she is getting milk from me because I see it in her mouth plus I have been pumping here and there. The amounts are just not enough. What can I do, I’m so sad about this. I really hoped to breastfeed.....