Three is the roughest number to have. I'm not sure why, but we saw it in our family (six) and most of the moms at my church agree, three is a tough number of kids.
Going from two to three was a harder transition than going from one to two. Individually, we had run out of arms, and collectively, we had run out of laps.
; )
I agree, three is the worst, and after five, the additional ones don't seem like much more work. It's like cats, I guess ... once you hit the Critical Mass, you can add more indefinitely.
I think it's because the two older kids gang up on the youngest. And then there's the middle child who thinks everone gets the perks but him. Hmmmm. Such a mystery. We had four in my family--two girls and two boys-- and NONE of us ever got along.