I carried, birthed and nursed four children my friend and stressed every single time.
First it took me a long time just to get pregnant so I was terrified first go round to do ANYTHING that *might* hurt the baby, then it was just the added stress of how'm I gonna take care of a household, a business, ANOTHER baby, the bab(ies) that were already here, our business, my marriage, social obligations, oh yea...... and me.
I know how nerve-racking it is for a man to see his lady change like that and how much her role changes in your eyes. Imagine how SHE feels?.... think about all the pressure she is putting on herself that she may no even be sharing w/you.
THE LAST THING SHE WANTS TO HEAR IS GRIEF.
I know your heart and I know you are a good man and want to support her in every way. After all, she is the mother to your children. But before she became a mother, SHE was the center of your world as your life partner.
So now, comfort her all you can and tell her how DEAD SEXY she is and it took her 8+ months to *get this way*, it is RIDICULOUS for her to even THINK about changing her *body back* in less time than it took for her to get where she is.
The damage is done, so to speak and no amount of preaching is going to help her. I know that bringing all sorts of sweets into the house doesn't help matters ESPECIALLY when one is pregnant. Go ahead, put gummy bears or ice cream or browniies in front of a pregnant woman who is feeling well and tell her, "Control yourself! Only eat a small portion."

Yea *wink* OK.
She is near the end. Her appetite will most likely decrease anyway as the baby gets so big there won't be much room anymore.
Talk to her A LOT as this is probably weighing heavy on her mind with all the other stresses associated with becoming a parent AGAIN. I *wigged out* near the end of every single one of my pregnancies... very normal. It is part of the body's hormones regulating themselves yet again. I know it seems like asking a lot, but BE PATIENT. This too shall pass and as Ms PreggoRae pointed out, but she will remember the negatives if there is more of them to remember.
The decision to nurse your baby is one of THE BEST that you could have made as nothing is better for both mother and baby.
Once she gets the *OK* from the doc at the 6 week postpartum mark she can begin a more rigorous exerise program if she feels up to it. As for her diet, she needs to eat MORE, not less. But cleaner healthier and smaller frequent meals and LOTS of water.
Get her to join the women's forum where there is A LOT of sound advice in this regard. There are MANY moms there who can pass on their knowledge and SUPPORT.
If she has any questions for me I will be glad to help. It's been a while since I found myself in her position (stressing mom to be) but it's sorta like riding a bike.....
Or was that the sex part.
Been so long.... can't hardly remember. You know they say that your memory is the second thing to go with age. Wish I could remember the first.