What a charmer! By 3 months, baby is probably smiling plenty, and she's likely started to imitate what she hears and sees (so watch what you do, mama!). You should chat with her throughout the day, describing what you're doing, how you're doing it and where you're going -- this is how she'll eventually learn to talk! Just don't go too crazy. Baby is a quick learner, but she needs you to keep things clear and simple, and to recognize when she needs a break.