Hate to mention this, but did you man watch you giving birth? If he did, he may still have that memory fresh in his mind (even if wouldn't admit this to you), I speak from personal experience here. It passes, but for now I would avoid things like walking around naked, besides if you have recently given birth you might yourself feel self-conscious about the shape of your body.
I would do something that shifts the focus away from your "lady's garden". A surprise, like a new sexy outfit does the trick for some men, personally the first thing on my wish list after a birth would have been to wake up and find my wife unexpectedly going down on me. You say you're not very "outgoing", but are you at least "downgoing"? Because that's the one thing that a man will always be thankful for. Maybe you do go down on him but you don'l like to swallow. That's common, but it would be the best surprise of all if you were willing to do it as a special treat: just picture this, he is getting ready to withdraw and you push him back down to signal that you want to swallow - and then you just do it.
Apart from the fact that he will love you forever, it will also put sex right back on the table for the two of you, because he won't be able to stop thinking about it and he will think that giving birth has turned you into a horny devil. Any resentment towards the baby due to lack of sleep/fun/freedom is immediately banished.
Maybe you already swallow in which case ignore all this. If you don't because you find it gross, I can understand but it would be a worthwhile sacrifice and much, much appreciated. It doesn't taste very nice, granted, but it won't hurt either and you can have a glass of water ready next to the bed to wash it down.
Good luck, and have fun.
How about shaving downstairs? Nearly all men I know love that.
Secondly is to buy exciting clothing. All men like that.
Walk around the house naked if possible, that will be nice, and come up to him regularly.