We always thought 3 was our magic number, but after DS (2nd child) I realised that what I wanted was another pregnancy and newborn - I didn't particularly want to do potty teaining/tantrums/baby proofing three times, I didn't particularly want to have children or teenagers three times.
So our #3 was quite a surprise! She is 11mo now, and I am absolutely, utterly over any broodiness or 'what if' that was left in me. I'm emotionally exhausted. I have to be ultra strict to ensure the older two don't descend into Lord of the Flies, and that's draining. I'm worried about finances - DD1 has always done some sort of club, from baby classes for me to meet other parents to gymnastics now, but so far we've been unable to afford the same for DS. I have no idea if we'll ever afford it for DD2. I think about the emotional support they're going to need in the future and I already feel like I'm stretched too thin so I have no idea how I'll manage when their emotional needs are more intense.
Financially, it's not just an extra person - it's the bigger car and house. An extra set of childcare fees. Holidays are impossible in a single hotel room - we're either looking at suite-type arrangement for megabucks, or self catering (and let's face it, that's the same shit in a different location).
Logistically it's more complicated. Older 2 need taking to school, while dd2's nursery is in the opposite direction - it's a 2-person job. IF we ever get ds (and dd2 later on) sorted with clubs of their own, we'd better hope that they don't clash!
Having said all that, I can already see how much they adore each other. Once ds grows through his obnoxious 4yo phase, and dd2 is old enough to get involved, they are going to have so much fun together. I am so looking forward to being out of the baby stages finally, when they can really start to function together. It's not all bad, but it's bloody hard work at the moment.