Upping milk supply

I really need to up my milk supply. My baby was sick and is satisfied with 15ml per feeding at 11 days old. Pediatrician wants him eating more because he's losing weight :( They want 50-60ml each feeding. I've been pumping after each feeding but I'm having to supplement with formula because I'm not producing enough :(

No hes not just unlatching and I'm thinking he's done. I spent 10 days in the hospital because he was sick, the watched me feed him and we had to "finger feed" him. I pretty much have to force him to eat because he was sick. Please don't judge me I've had a hard enough time with this.