The Babymotion project investigates how infants develop the ability to perceive and understand human motion, a key aspect of social cognition. Focusing on the superior temporal sulcus (STS)—a brain region specialized for processing dynamic social stimuli—the study examines how biological motion perception emerges and evolves during infancy. By combining eye-tracking with functional near-infrared spectroscopy (fNIRS), researchers will explore how motor experiences, particularly the onset of crawling and walking, shape neural specialisation for action perception. This study will provide novel insights into the interplay between action observation and execution, advancing our understanding of the neurodevelopmental pathways underpinning human social cognition.