On the side of the formula box it says for his age (6 weeks) he should be having 5 x 5 oz in 24hrs. He's currently having more than this. He has nearly 8 5 oz's and is showing signs of needing to increase to 6oz at some feeds. Ie draining the bottle and then needing more soon after.
He's already 12lb 10 after being born 9lb1.