Well here is another perspective from a "new" mom. I had my son 6 weeks ago (if I recall correctly PinMonkey your wife and I were due the same day, I just delivered 2 weeks early) and unfortunately have a case of the stretchmarks and not as firm boobs. As far as the lifestyle, I happen to be the one with the higher sex drive, so wanting to get back into it wasn't an issue, but there are definitely body issues.. I also have a 6 year old and I promise within a couple months sanity will return. With my first I didn't have any help, and it was hard, but with this one my husband has been wonderful helping with nighttime feedings and such. It's hard for him too because he is not only working full time but has a second job and is doing college courses. His primary job sent him for additional schooling for the next 6 weeks so he's super stressed. I do what I can for him, but his helping me in ANY amount is appreciated.
Your wife needs more than anything else your love, and support. Even if it's doing a load of clothes now and then and getting her a flower. Or letting her just leave for an hour or 2 to visit a friend. I know that I start work again Monday and am counting down the hours. Going stir crazy here at home
Another tidbit of advice. Make time for a date. It *IS* hard leaving them the first time, but my husband and I went a year without a single date night for ourselves and it was a big mistake. Sometimes you need to take time from being a parent all the time and just get to be an adult enjoying your spouse for a little while.
Since she and I are going thru the same things, tell your wife to feel free to email/pm/message me anytime if she needs to talk or anything
~Blade~
PS Cocoa Butter helps with reducing the appearance of stretch marks as does Vitamin E. She can get creams for both at Walmart or the like.