You have no idea how to operate a single stroller....
I had to take just Piper to the doctor this AM, and brought the single Peg Perego stroller that we got as a hand-me-down. When I got there, I had no idea how to unfold it, so I just ended up carrying her inside in her carseat.
Re: You know you're a MoM when...
You don't need a single. If you can afford it and think it would be worth the money then yes, or find a good deal on Craigslist or somewhere, it would probably come in handy in some situations. Or if you're only taking one somewhere, you could just carry the carseat/baby, use the double stroller and use the extra seat to hold the diaper bag, and then when they get older let them walk. We don't have single stroller, and I think there have only been about 3 times when I thought, "hmmm a single stroller would come in handy right now." Not worth the money to me for 3 times.
hahaha!
yeah i feel like sometimes i have OCD! i know its not funny but i spend my days doing things 2xs that it feels wierd when i dont do something twice!