R.J.
With SH all the way, reread hers. I only have 2 new things.
1) Why formula? (check out la leche league, for a gazillion and one tips, tricks, & FAQ's). Not a judgement call...Obviously, sometimes we have no choice...but if he's nursing well, you DO know that you're only training your body to not make enough milk if you keep supplementing, right? It typically only takes a day or two for your body to "catch up" with increased demand...sometimes even less...<grinning> and you can tell when demand is increasing or decreasing fairly easily...either you're feeding reeeeeally often one day....or you leak for a day. :)
2) There was some concern in the beginning that my son might not have been getting enough to eat, so I worked with the lactation consultants at our hospital. Now, my son was big too, (10 lbs at birth) so this is by no means the "average" (5-10 oz per feeding being the average)...they found that at just a few weeks old he was getting an average of 20oz per feeding! Zoiks. He'd drain both breasts dry. Did until he stopped nursing. How they found this out, btw, is that they have EXTREMELY sensitive digital scales that were baby sized and took a reading in about a quarter of a second...they'd weigh him, he'd nurse, they'd weigh him again.
Oops...one more thing... On the subject of hind milk: They were times when I'd nurse and it would be super quick (like 20-30 minutes)...but most of the time my son would nurse for an hour or more. (Essentially half an hour each breast...and then wait an hour or two and then eat, etc.) While there were many times that I just snuggled and loved on my wee one, what became my habit was to read while nursing...or hang out with a friend or my mum or sister. I wasn't one who could talk on the phone & nurse or study and nurse, but quiet one on one time with someone I felt comfortable "flashing" ;), no problem. It was a good time to connect both with my child, other people I loved, and to take some "self time"...so those hours spent nursing were times I really enjoyed on multiple levels. Mostly, though, I curled up in the rocker with my son and a good book. 9 months later...when I lost my milk (long story short, massive infection) I'd gotten through an entire 47 book mystery series. And I'll tell ya, those counteless hours, looking back on it they were gone in a blink. Enjoy them.
Good Luck!