I personally don't think it's uncommon. All of my kids and all of the kids of my peers were taught to swim from a very young age. I remember bringing my kids

I personally don't think it's uncommon. All of my kids and all of the kids of my peers were taught to swim from a very young age. I remember bringing my kids into the pool before they could walk. The US is a big place and I'm certain there are areas where it is less common.