Do You Know Me

do during Mass, I realize the baby in a carry seat is the same baby that was there last weekend. He looks at me, but I don't think he recognizes me. I wonder when babies start recognizing faces of people that pop up in their lives more than every day? Or do they just have immediate reactions to recurring faces based on that face versus prior knowledge? And will Josie have me confused with Mr. Clean if I wear a white t-shirt around the house?