Hello Chris,
Welcome to MB.
Just to get this question answered right off the bat: has there been any Infidelity in your marriage? You posted here on an Infidelity message board and although we have had a few stray newbies come here because they were advised to or didn't know where else to go,we can help better if we know the full story.
If there has been no cheating,then do focus on what YOU can do to help the situation right now.A common theme here is that you can't change other's,only yourself.I hear you saying that you are not attracted to your W and that is ok.For some people,physical attractiveness is important,especially if it's related to health issues.There is nothing wrong with being honest about your feelings but this should be dealt with in a very gentle way so you won't hurt your W's feelings.
As Pep said,there are common female vaginal odors that can indicate an infection and are easily treatable.BV can cause a "fishy" odor and is a classic sign noticed by the woman and/or her partner.
Encourage your W to see her doctor and mention that you will too.Perhaps you could both go for an annual check up and discuss with your doctor's an exercise program? Do you cook together? How about some changes on the menu: cooking can be fun and there are so many books you could peruse for healthy recipes that could make you both healthy and fit.Are you both getting out and exercising? Can you join a club or do a hobby that interests you both and burns calories( i.e. swimming,canoeing,walking,etc)?
If you still love your W Chris then do something about it.Maybe this isn't all about your W.Have you thought about counseling? Anything else going on for you? How old is your baby? Do you think that maybe since the new baby arrived you view your W differently? It is not that uncommon to have issues with your W after the birth of a child and it's not all that uncommon either for some women to gain weight after the breast feeding stage is over.Maybe you can talk about it.How is the parenting going?
Also,check out our MB book store.There are a lot of choices for how to keep the love alive and how to improve your marriage and to deal with problems.
O