A baby has been left alone in a shopping cart near the store’s entrance for a little too long. He’s moaning sadly to himself, not yet crying. I give him a little encouraging smile, and he quickly reassembles his composure. He looks back at me with a business-like expression on his face and waves hello. His waving gesture is oddly practiced and deliberate. He resumes moaning and begins rocking forward and back after I walk past him.