Boy, does this thread resonate.
DD won't be an only child, she just won't... for various reasons ranging from religion to family background I am GOING to have at LEAST one more baby (which is a far cry from the "I want a big family" I used to say). I
do still want a big family... but not with me as the mother, at least not the me I am now. My perfect ideal family contains a mother who isn't horrified by the idea of another pregnancy and childbirth, for one thing; a mother who can actually keep the house consistently tidy, and garden for more than a few weeks at a time, and remember to do stuff with the baby rather than letting it fend for itself as long as it's happy.
I feel stupid complaining, because a) I only have one, b) she's not a "hard" baby with any health problems or allergies or behavioral issues, and c) my family's pretty good. Mum drives me places pretty often, rings up to say hi, babysits if we ask (all of twice so far, but still). And most of the time I actually do feel fine- but it only takes twenty minutes of DD whining or interrupting an important task to make me feel "WHY did I DO this??"
So now I spend a good deal of time gloomily contemplating the thought of doing it again.

DD's newborn stage was actually manageable at the time - we took a deep breath and wanted to prove to each other that we were good parents, and just sort of dived in expecting the worst.

But now she's older and I have a bit more freedom, I look back and go "Yeah, actually, that did kinda suck", and the thought of voluntarily putting myself in that position again frankly scares me. What, leaky painful breasts again when DD has just stopped breastfeeding every twelve seconds? Sleepless nights again now she's finally sleeping through the night? Letting myself in for pelvic girdle pain again
while trying to chase a toddler? Aargh!
It doesn't help that I don't get babylust. Never have. I get cooey around babies and love seeing them around town, but that doesn't translate to wanting to actually have one. I wish it did! Would make things so much easier. I feel like it would be OK if I suddenly
was pregnant, but the thought of deliberately doing it is just too scary - does that make any sense? I have these horrible thought that having one or two or three more babies will mean our family just gets gradually dingier and more depressed, with me snapping at DH and children squabbling on a dirty kitchen floor - you know? I think it doesn't help that in my (big) family Mum and Dad
did argue a lot while I was growing up, and the house always
was messy and so on.

But then, I have a great relationship with my sisters and they were the best gift my parents could have given us. So there you go. Aargh, this is hard...