Your baby is giving you back to back surprises with new developments constantly, as your baby smiles at you. And perhaps this is the one thing that you were looking forward to for a long time - a beautiful smile on your baby's face. By this stage, babies get little social in their behavior. The reason is simple, because now they have started to recognize faces to an extent.
Smiling is a natural process and like all humans, your little bundle of joy will also show her pleasure with a smile, just as she shows displeasure with a cry. Smiling is yet again an important development. Your little one is growing emotionally, mentally as well as psychologically. Hence notice your baby smiles at you, whenever you have a conversation with him.
So, while your baby's smile is making you happy and gleeful, it should also give your immense peace that your little one is growing very well and reaching her milestones in time. Let those smiles light up even the darkest hours of your life. Soon, you will notice that your baby smiles at strangers and people who pass by him, to greet them!