Why do babies smile while sleeping?

@maroseqf (3657)
November 14, 2008 8:14am CST
My baby is now 10 days old and I am so glad seeing him smile during his sleep. He is so cute. We have this idea that angels play with baby especially those who are newborns. That is why little babies smile. Some say that they are having dreams. But I am thinking how will they dream of something if they do not know anything yet. Well, I just enjoy seeing babies smile.