Feel like my baby doesn’t eat much

So my little one had rsv at 4 weeks old, we are now 7.5 weeks and I feel like he doesn’t have a huge appetite since he was sick. I breast and bottle feed so I don’t know exactly how much he gets daily. But I usually only breast feed him overnight and he’s only taking in like 15 oz or so during the day and only eats once at night. He’s gaining about 7-8 oz a week but it just doesn’t seem like a lot and the most he takes in one bottle is 3 oz and it is tough getting that into him. Anyone else’s kiddo not eat a ton and is doing ok?