Research has suggested that a baby's smile "lights up the reward centres in the mother's brain in a way similar to that observed in experiments on drug addiction".
I have to admit, seeing Brooke smile is pretty amazing. The one time she laughed (yeah, its only been that one time) was awesome and we wait each day to hear it again. Who knew this whole time I was getting high? Thats just an added bonus I guess.
The article lists a lot of technical mumbo-jumbo, but there is a suprising additional finding: mother's do not react as strongly to their babies sad faces as they do to their smiling faces.
And on that note, a little smiling-related humor