In this article, we study health literacy as entangled and situated processes of authorisation of pregnant women to become competent caretakers of their own physical activity and health based on the development of the practice of ‘learning to take notice’. Based on our ethnographic fieldwork in a randomised controlled trial on physical activity during pregnancy called FitMum, we develop a processual conceptualisation of health authorisation as multidirectional flows between participants, staff and technologies. Using the concepts of attunement and authorisation from Latour and Despret, we suggest that health literacy is not just something that can be acquired once and for all, but is processual and must be maintained, nurtured and developed through continuous negotiations, adjustments and adaptations to the constantly changing conditions of the health subject.