She has smiled since she was about three days old, but it her smiles were more of a physical reflex than a response to someone or something. However, around 5 weeks old she started looking right at me and smiling and cooing... especially if I'm being silly or talking to her in a really sweet voice.
I can't tell you how much I love her little smiles. They make me smile every time.
What a joy she is to us!