Babies Read Each Other's Cues (image) Brigham Young University Caption BYU research shows that babies can understand each others emotional signals at five months of age. These baby boys are cousins -- the one on the left is four months old and the one on the right is five months. Credit Jaren Wilkey/BYU Usage Restrictions Available for use in news coverage about the study. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.