Sense of Humor

I was driving with my daughter in law and grandson yesterday. She sat in the back seat with him. After a few minutes I heard giggling. It then turned into hysterical laughter. It seems that my daughter in law was making funny faces at the baby and he thought that it was very amusing. The sound of a baby laughing is one of the most wonderful sounds you can hear. At 15 months old, he has a sense of humor. His brain can distinguish serious from funny. His laugh made me smile.