Baby Talk

I was out shopping at Walmart Sunday. As I was walking down the aisle there was this cute baby girl in the front on her cart. As I walk by she says "hi" and I say "hi" back. What is it with as little verbal communication babies have, they always put a smile on your face when they talk to you? As I said "hi" back she got a little grin on her face like she knew she was cute and of course she was right! It's crazy that if you really think babies do a lot more verbal and non verbal communication than most probably think.