I have one DD, 3yo. For a long time, inc before I had her, I've thought I wanted an only child, and was happy with this. I worry I'm not the best mother, not v patient etc and quite "stressy" so having one, which can be hard enough to deal with calmly at times, seemed sensible. I don't personally believe children NEED siblings so "giving" dd a brother or sister wouldn't have swayed me unless I already wanted another, in which case it would be an extra pro.
Recently I've been feeling I want another. Like, viscerally, really FEELING it. However, I haven't just morphed into ms super patient calm mum of the year so if I had another I'd obviously feel even more stressed and find it even harder (I should add, I love dd and love being a mum, more than anything, but I do find it hard and wearing at times, which is made worse by my non patient nature!). So logically I feel it may be selfish to have another as I'd have even less to give to dd, emotionally, as I'd be even more tires and stressed.
I know not everu other of more than one is a picture of serenity :D so if you're not, how did you know it was right to have another?
I also am in the midst of starting 2 businesses and don't see how I could take time off to have a baby, so that's another worry!