You could give him a formula bottle to go to sleep and thereby "gain" a bottle and get more sleep while you are at it. This is what I did to make it all work out. Max didn't take more than 5 oz until this week....and he weighs 20lbs.

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Sweet Baby Max, Nov 3, 27 lbs and 31.5 inches at 1 year

I was a BF baby for 5 months