Over feeding?

Poonam

So I have started combine feeding. My baby took to the bottle as if a duck to water. I have started to express. I am finding my breast milk is not enough for him any more. Even if I give him the same as what I would formula he is starving two hours later. Is it possible to over feed? The only way I can settle him is to let him feed from my breast for a while.

Am I doing the right thing?