Mine are 23 months apart. Both were unplanned, but certainly welcomed. I would not space them any closer than that.
My DS is a real handful. He is SN, and he had a really hard time adjusting. He is still adjusting, I think, and DD is almost 1!
I think the biggest thing that gets me with closely spaced kids (and I know they get more closely spaced than mine) is the sleep deprivation. My almost 3yo still gets up at least twice a night and DD is a pretty good sleeper, but she still wakes twice or so as well. My 3yo has given up his naps, which means that I get lots of 1-1 time with him while she sleeps, but she gets almost NO 1-1 time with me. I also had to wean him before I wanted to because I just could not make it through my pregnancy with the nipple pain, and because of supply problems with him, I was worried about the two sharing the milk.
Obviously, everything is dependent on your existing child and your family situaion, if you have enough support, etc., but I wouldn't do it. I really want another on now but whenever I think back to the first 6mo of DD's life, I feel like I can wait.
My DS is a real handful. He is SN, and he had a really hard time adjusting. He is still adjusting, I think, and DD is almost 1!

I think the biggest thing that gets me with closely spaced kids (and I know they get more closely spaced than mine) is the sleep deprivation. My almost 3yo still gets up at least twice a night and DD is a pretty good sleeper, but she still wakes twice or so as well. My 3yo has given up his naps, which means that I get lots of 1-1 time with him while she sleeps, but she gets almost NO 1-1 time with me. I also had to wean him before I wanted to because I just could not make it through my pregnancy with the nipple pain, and because of supply problems with him, I was worried about the two sharing the milk.
Obviously, everything is dependent on your existing child and your family situaion, if you have enough support, etc., but I wouldn't do it. I really want another on now but whenever I think back to the first 6mo of DD's life, I feel like I can wait.
