My cat won't eat his food?

I don't think he's sick at all, but my tabby cat, Charlie hasn't been eating much, if not any, of his cat food. He's 10 moths old, and still growing, so we feed him a 5.5 oz can of merrick in orted flavours every day, and he has unlimited access to Wellness Core dry food. We figured that the varying flavours would prevent his boredom, but I'm not sure if that's the problem. He always seems hungry, so I or my mother (I'm 16) will give him a Fancy Feast appetizer (which is really just meat) or a small jar of organic, all meat baby food in the morning. Am I jut not feeding him enough cat food? He's about 9 pounds, and 10 months old, like I said. Or is his just being greedy?