Feeling low 🥺

I’m feeling a bit bummed. I’m a first time mom, I had my son March 8th via c-section. We had his 2 month check up yesterday and at birth he weighed 7.9 and at his 2 month check up he only weighed 10.5. His doctor made a comment that he was “super tiny” and that her daughter weighed 13lbs by her two week check up. Which made me feel like a terrible mom. I breastfed for the first month while supplementing formula, my supply was never good after my traumatic c-section & getting mastitis the first week after he was born. He eats 4oz every 2.5/3 hours, so it isn’t like he doesn’t eat. I just feel like a terrible mom. I feel like crap because I wasn’t able to breast feed. I feel like crap because he isn’t gaining a lot of weight. Now I’m worried something is wrong with him. 😭