Babies can sense one another's emotions by the time they are 5 months old, according to new research from Brigham Young University.
"Babies are very sensitive to emotion, probably from birth," said psychology professor Ross Flom. "In the first five or six months of life, that is the primary means of communication."
Flom has also studied infants' ability to understand the moods of dogs, monkeys and classical music. For this study, he seated infants in front of two screens, one displaying a recording of a happy, smiling baby and the other showing a sad, frowning baby.