Our LO has been smiling since 4 weeks. It's always been hit or miss on when he would smile. He has to be in a good mood, usually just after waking up and eating. However, I feel like he doesn't smile at us a lot. Sometimes he will smile at the animals on his play gym, and I can get some smiles when I work at them (making faces, funny noises, etc.) but he only occasionally just smiles in response to one of our smiles. I was wondering what others LO were doing?