Your baby might move their arms and hands as they make sounds, or look towards you or an object that interests them. Your baby’s movements and sounds will attract your attention. When you respond to your baby, they will learn about the social world around them, as well as about the objects you look at and talk about together.
So, each time you respond to a wriggle, you are helping your baby learn how to share attention with others and communicate.
References:
Moreno-Núñez, A., Murillo, E., Casla, M. & Rujas, I. (2021). ‘The multimodality of infant's rhythmic movements as a modulator of the interaction with their caregivers’. Infant Behavior and Development, 65, Article, 101645.
Scola, C., Bourjade, M., & Jover, M. (2015). ‘Social interaction is associated with changes in infants’ motor activity’. Socioeffective neuroscience and psychology, 5(5).