I'd disagree that you'll know for sure if you have the right amount of kids. I will always kind of regret not having a 3rd (especially because our families on both sides are whittling down to nothing, due to childfree adults and only children) but I think we made the right decision stopping at 2. Various reasons include:
- Our house is 1200 sq ft with 3 bedrooms: another kid meant someone would have to share a room, and there's not a lot of room to share.
- The second kid was much, MUCH harder than the first, and the sleep deprivation nearly broke me.
- Husband and I were getting older and autism (along with other disorders) loomed large in our minds.
- Our neighbors two houses away went for kid #3, and got surprise #4 at the same time.
If we had started younger or gotten a bigger house, we might have gone for it. As it was, getting my tubes taken out was, I think, probably, hopefully, the right move.