My 2.5 year old son is a hitter. Not very often, but he will swing at me or pull my hair in frustration if he doesn't get what he wants. I'd say it happens once a week, give or take. We don't spank him, we do use time-out for 2 minutes and we always talk to him about what he did wrong and how to use his words, etc. He talks pretty well, so it's not that we don't understand him. He just gets angry if he doesn't get what he wants.
Just please someone tell me that they have a hitter too. We've been "attachment parents" from the start and it's embarrassing and depressing to see our child with violent behavior. Everything I read tells me that teaching kids to be "independent" causes them to be violent, not attachment. It's just frustrating and embarrassing (did I mention that?!).