What exchanges during pregnancy, what sensory polyphony during the first months of baby's life, how does he access the game of surprise and humour in his first dialogues, what playful situations to live with him in the perspective of a sustainable world: so many questions that arise for parents as well as educators and teachers in initial schooling. Acting and interacting with children from birth requires being welcoming and in tune with their needs. How can we offer a flexible and protective framework to children so that they can develop their natural curiosity and accompany them on their path of discovery in a caring and structuring way? This is a good opportunity to take into account the proximal areas of development in order to act and interact constructively in all areas of human development. Nourishing at the same time their affective, relational and cognitive capacities, supporting their creativity and skills, fermenting their curiosity and their motivation to act and interact with their environments: the child can thus promote his or her capacity to be fully-fledged. Partner always, victim or executioner, never!