From 4 to 6 months, infants react when a muted video clip of a person speaking changes language. Babies generally lose this ability at 8 months unless they are expose to multiple languages. Another study showed a child's ability to gesture at 14 months can predict their vocabulary a age 4 and 5. These findings suggest it is important to spend time with your baby and use visual cues and gestures to help them gain skills early on.
first language and accent
Early Childhood Gesture and Affluence.