Okay. It depends on a lot of things for me.
Infants and newborns terrify me. They're ugly, they're loud, they smell, they seem to want to spew from every possible orifice, and they look like frogs with giant, squished heads. They thoroughly creep me out. I know it sounds mean, but it's true.

Seriously, put me in the same room with a screaming baby and just watch me become instantly crazy and stressed out to the extreme. It's truly scary.
And this is a bit irrelevant, but you know those baby dolls that make the little 'wah, waah' sounds when baby is supposed to be 'crying'? Hell no. That's crap. When a real baby is upset, they scream their freakin' heads off. It's like listening to a banshee clawing its way out of the pits of hell.
I like being around children who are generally well-behaved. Granted everyone has a bad day, but those little turds whose parents don't teach them any better, the ones who throw tantrums over everything and they're mean (especially if they're mean to animals, I HATE that!), can't stand 'em.
But the nice kids, they're cool. They're whimsical, imaginative, surprisingly clever and intuitive. I don't mind that at all. That's cool. Granted, all kids are selfish little sociopaths to a degree, but they can't help themselves.
And I don't think it's really kids that bother me, it's parents who don't take good care of their children, and so their children turn into little a-holes and make the lives of the nice children around them a living hell (I'm living proof, my life from K-12 was hell). I can't stand a crappy parent, it pisses me off to no end. I honestly believe there are some people who are true A+ parents, and some people who never, ever should've contributed to the gene pool.

I, on the other hand, would love to someday have at least one child (hopefully I'll have twins and just get it all over with in one pregnancy instead of having to do it twice) with the love of my life. When I'm ready for parenthood, I think it will be quite an adventure.
...Wow, I ranted a lot. Sorry. I didn't realize I cared so much about this subject.