Blueberries are not for the immaculately dressed infant!
We never got the chance to introduce Buttercup to fresh blueberries, since they were in season before she was capable of safely handling them. However, now that her pincer grasp skill is firmly developed I got some frozen ones and they have proven to be a huge hit. If you are going to use frozen blueberries for your little one I'd recommend going organic, as frozen blueberries can pack quite the pesticidal punch (even more than your average non-organic produce).
Anyway, because they had been frozen these berries were quite soft when thawed, so they were really easy for Buttercup to chew. In fact, I've never seen her eat anything so fast. She was literally eating them hand over fist. I am thankful that I put two bibs on her, though, because her outfit would have been destroyed by the purple juice.
PROS: high nutritional value (antioxidants!)
CONS: non-organic is high in pesticides, very messy