Recent studies have highlighted this reality: the early years of a child’s life, including the prenatal period, are a pivotal time for their development. Thus, experiences at the very beginning of life—whether positive or negative—have a lasting impact on individuals’ physical and mental health, as well as on their social and emotional well-being. This issue of La Santé en action shares the latest scientific findings, particularly from the fields of psychology and neuroscience. It sheds light on interventions that support parents in building warm, stimulating interactions that meet the fundamental needs of young children. Indeed, children need to form a secure attachment bond with their caregivers—a bond that is essential for growing up with confidence and strengthening their ability to cope with adversity in the future.