Just tagging along to work out my own thoughts.
DH has been talking about having another one lately. We just have the one, and she is 6. DH and I are both 35.
I was an only child and perfectly happy with it. DH was one of two, so of course he comes from a family experience of two children.
Pregnancy and birth: I'm ok going through this again; I'm not exactly ecstatic to do so but I can deal with it.
Finances: DH is a bit worried about this. I feel like it would work out ok. Sure, we wouldn't be as secure as with only one child, but we would certainly be able to care for another child. One worry would be the cost of the birth - $1k if we used the hospital this time, and a lot more if we used a midwife again. Every time I think to myself "ok, I guess I'd just go to the hospital and just wait as long as possible before going" my brain just shorts out. I don't think I can do it. So I guess, yeah, we'd have to pony up for a midwife. But this isn't a show-stopper for me. I think having wanted children is more important than more money in the bank (though of course I think parents should be financially secure enough to adequately care for their children, but we can do that).
Health: I think this is where I'm really anxious. DD's first 3 years took a LOT out of me. Heck, to be honest, even giving birth to her took a lot out of me. But the lack of sleep was extreme. Oh, it was awful. I ran my health into the ground. DH, reasonably, feels we can do things differently this time, and I think he's right. But I still feel like I'm kind of still recovering, so I am afraid of putting ANY more stress on myself, if that makes any sense.
Baby fever: If I wanted a baby, then even the health thing wouldn't stand in my way. But I apparently am one of those women who don't get baby fever. Oh, babies are cute, sure. But seeing one doesn't ignite any fire in my belly. Apparently it does for DH - he'll see a cute baby and WANT one. However, maybe this isn't a real factor. I didn't have baby fever before having DD either. I just intellectually felt that life would be empty without being a parent. DH and I got married. We finished college (we married while still in college). We got jobs. We saved up for a house. We decided we'd start a family when we got a house - our apartment was great but so tiny we couldn't picture living with a child in it. (And probably illegal anyway; it was a one-bedroom... probably 400 or 450 square feet). So we moved into the house, and it was time to have a baby, right? I waited about 6 months for the feeling of "yes! I'm ready!" to set in. It didn't budge. So I just closed my eyes and jumped off that cliff. I was never really ready for it. But no regrets at all; I love DD with all my heart. And I know intellectually I'd love another child if we had one.
But to make the active choice to make one? I just really don't know.
I've told my husband if he wants one I'd do it for him. He's not sure. I know if I told him I wanted one, he'd be onboard right away but he's not sure about making that choice alone. I don't blame him. But I did put that out there because I know a lot of women really want another baby and their husbands just say no - I don't want to be that spouse. If DH feels a space in his heart he needs to fill with another child, I will do that. If we did this there would be no resentment at all, but I would feel some fear that I would no doubt come to MDC to try to work through.
So I guess I just don't have any particular need for another child, but I would not say no if it came to be. DH and I also are on the same page about unexpected pregnancies - we would just welcome one into our lives even if it wasn't the "right" time. But that's still different from actually trying to make a baby, which my DH is thinking about.