Am I over feeding my 16 day old?

Ra

My son was 9lbs 9oz at birth. He was weighed at 13 days old and is already 10lbs 10oz.

I am breastfeeding him but mainly expressing and giving him this via bottle as he is struggling with latching. He had been taking 2-3oz then went to 4oz but tonight he was looking for more and took 5oz at one feed but then appeared uncomfortable. Can he overeat? I didn't expect him to be taking 5oz at 2 weeks old.