My sister is almost 4 months

She is growing up fast. She loves to talk even at just at 2 months old. Now she would engage with me on her gurgling conversation. She often smiles at me and everyone. Very attentive to things, always look around left right left right, using mirror to talk and love bath time. I have been taken away all the attention all day, hence she is often play by herself. She can sooth herself to sleep, such a good baby.