Bee and I lucked out in that we both wanted two kids. But we actually had pretty different reasons for arriving at the same place!
Bee was happy with the size of her family while growing up (she has one brother), and wanted to recreate that. I wanted more than one (not sure why) but also wanted to be able to focus on my career again... so two felt like a good compromise for me.
Why do you want the family size that you want?