Many of the positive (e.g., empathy) and less positive (e.g., anxiety) outcomes of development are the result of brain–environment interactions beginning in infancy. The current technology used to understand these brain–environment interactions in infants is limited to controlled laboratory settings which are very different from infants’ naturalistic social environment. Wearable biosensors could facilitate developmental neuroscience research in naturalistic settings, but they are currently not suitable for infants. York Infant Social Neuroscience Laboratory aims to strengthen its partnership with PluX for building infant-friendly wearable biosensors and the required data analytic strategies for measuring infant social development in the ‘wild’.