What!?

I am, apparently, the only mom in my yoga class who is breastfeeding their kid. Now, I must say, I haven't asked any of them about it, maybe there are really valid reasons, but all of them?? Impossible. I'm a little shocked. I thought it was so mainstream here. Doesn't almost everyone breastfeed their infants?? (or at least more than 20%?) I've seen organic clothes and even cloth diapers, and the moms are doing yoga.....but not breastfeeding? In my books breastfeeding is more important than all of that. The health benefits, alone, are hard to ignore, both for mom and baby.
What gives?