I have an idea do something really fun that no one ever does. FALL IN LOVE AGAIN!
I know it sounds absolutely absurd doesn't it?
You married your wife because she was your EVERYTHING> She was beautiful she was kind she was supportive etc etc etc. You married this woman for a reason buddy. Not only that but this gorgeous woman bore you a beautiful baby whom you are obviously crazy about.
You are going througha pahse buddy. The most stable relationships go through it. Things get boring/unexciting/ predictable. Well man you're the man so instead of taking the easy way out and leaving take your wife for a trip, just the two of you mind you, and spoil her to death. Even if you don't want to, trust me it helps. When you make her happy you will be amazed at how happy it makes you. Dress up for each other, look sexy for one another etc.
The only woman I ever loved left me and now I think she is regretting it. Don't leave your wife. You may not think you love her but you can bet that will change after you spend a 6 months away from her. You will say to yourself "I am nuts what did I do?"
90% of relationships are ROUGH and 90% of the time the grass is not greener on the other side. You have a responsibility to yourself, your child, and most importantly your wife. Humans are curious yes that's true but give it some time. You care for your wife a lot more than you think.
I am not trying to sound like a jerk, in fact, I am trying to save your from making what I think to be a horrible mistake. Bring up your concerns to your wife, see how she feels, and work it out. I would say though man love your wife and honor her the way she deserves to be.
I hope everything works out