This is just my experience, but i'm an only child and i found it boring as hell. I don't have very good social skills at all and i hated always having to play by myself. Even now i wish i had a sibling(especially a sister) to share things with etc, especially when my mum passed away 2 years ago, i felt so alone.

Me and DH would like 5 or 6 kids. One reason of that is because DH is also an only child, so our kids won't have uncles, aunts or even cousins, just each other.

With each child i have had, i seem to have more love to share. I don't feel they miss out on anything, be it socially, material or emotional.

But again this is jsut my experience. I believe each family is different and you have to evaluate what is in your life to make these kinds of choices and i also believe that whatever choice you make is the right one for you, whatever that may be.