[Desafinado]

Also, one other comment that hasn't been mentioned.

Having one kid is actually pretty easy. There are two of you, one of them. One of you is always resting at any given time.

When you have two kids it's a big change. If you're sharing responsibilities equally, now you're putting one of them to bed every night. And you're with at least one of them all the time, and if you're not, the other is handling both (harder on them).

And with two kids you're starting to see inter-child conflict, so it's not just managing two separate kids, but also their interactions.

In the long run having two kids can be beneficial because eventually they start entertaining each other. Currently, my boys are around 2 and 4, and things are starting to settle / they play with each other. If you just have the one, one of you is always going to need to be with them.

If you have three kids it's pretty intense. If you have four.. don't have four unless you fully understand what you're getting into.