My husband and I always planned on having three. After our second, who was difficult the first year, we decided we were done. About 6 months later we both started to feel like we wanted another child. We went back and forth about time, finances, etc and then just went for it. Our third is now a year old and I can't imagine a day without him. Seeing the other two growing up (ages 3 and 5) has reminded me to slow down with him and enjoy every minute of having a little one. My kids are all two years apart which has pros and cons, I think any age separation has issues, but we just try to do things as a family as much as possible so that they can form relationships with each other. My brother and sister-in-law had twin boys first too. They ended up having a little girl less than a year later. I know things were crazy for them for awhile with three little ones, especially diapers, etc, but now the kids seem to have so much fun being close to the same age.