baby Weight

Cody
I feel like such a terrible mom already. James is only 4 days old and he's lost 11.9% weight because my body just isn't producing anything (dr said its because of having a c-section and it slows the milk process down a lot) even though he's latching and suckling every 1.5-2 hours. I'm just so frustrated and I feel so bad for him losing weight cause I feel like I'm starving him unintentionally. We've started supplementing but now he won't take the boob, he only wants the bottle. Someone else going through or have gone through this? Any tips?