A baby’s gentle murmurs and coos can melt even the stoniest heart. But those giggles and babbles are more than just music to a doting parent’s ears.
These vocalizations actually are signs that a baby’s heart is working rhythmically in concert with their developing speech, researchers report in the Proceedings of the National Academy of Sciences.
A baby’s first darling sounds and early attempts at forming words are directly linked to their heart rate, researchers found.
