Experiment is one thing, but nearly all married women who have kids usually just close down shop! That is very unfair and by doing this they push their husband right into the arms of another willing, able and usually younger woman, and then they cry foul! Its hypocrisy at its worst!
Gayhook93, I don't think women close the down shop as a general rule after they've given birth.
You have to convince her, that "sexual life" is not over after birth and that sexuality is still part of both your life. You must carry on with being nice, making compliments.
I think, that if you let her know that you still value her body, and you are still receptive to all her beauty, that she will open the down shop.
I am not married, but I think after some years of marriage, sex can become like an automatism. At least a men could expect sex like a given right in marriage.
If you are someone like that, probably you are not anymore enchanting to her as you once was.
Add some sexist elements to the relationship with her, without becoming a pervert. Be nice to her, and let her know that you still value her body.
If you don not have any serious problems with her, I don't see any reason why she won't open the down shop again.