The only way I can see it mattering is if you have a little girl (my brilliant powers of reasoning have suggested from the subtle clues in your signature that you have a boy ) Even then, it would be years and years before it became an issue.

For the record, I have 7 kids and the 9 of us live in a 4 bedroom house. Cozy! I grew up as an only child so never shared my room except for sleepovers.

My kids love having each other.