How many oz for 12 week old?

Dominique • Myles John 3/8/16. Micah Robert 6/29/17 baby girl due 10/8/20

I'm leaving my son for the first time at bedtime, he is breastfeed. Not sure how much milk to give him in a bottle. How much is everyone's 12 week olds drinking? I was thinking 6oz, too much or too little?