Just gave birth and already feeling those jitters again

Well, I'd definitely wait until your little one is 6 months old. Your body needs time to recover too. I don't know if you're breastfeeding or bottle-feeding, but I think being pregnant does affect your milk supply. Plus, often (though not always) your period won't come back as long as you're breastfeeding, so getting pregnant usually doesn't happen quickly while you're nursing. They say "9 months on, 9 months off" for a reason. You're not a brood machine; it takes a toll on your body. If you want your kids relatively close together, it's best to use condoms in the meantime until the time comes when you really want to try. You'll have to decide for yourself, but I'd wait a few more months and enjoy your little one you have now.

By the way, it's not strange to miss the feeling of being pregnant. For 9 months, you felt your baby in your belly, and then suddenly, he's out. It's not surprising that your belly feels empty; it's also a lovely, intimate feeling to have life in your belly. You're not the only one who misses that feeling.