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Maisons des 1 000 premiers jours® (First 1000 Days Centers) are innovative public-interest spaces for parental assistance, built on early prevention, early interactions, and peer support. Drawing on testimonies from the first Maison des 1 000 premiers jours® set up in Arras, this paper details the modes of intervention and prevention used. It highlights the key role of facilitators and their training. Finally, it outlines how these initiatives are evaluated. This universal program fosters the parent-child bond, combats isolation, supports parenting, and is rooted in an evidence-based public health approach. From birth, interactions form the basis for building emotional bonds and shape the child’s emotional and social development. Kindness, emotional availability, and adult-supported exploration allow the baby to feel understood, engaged, and secure. The pilot project in Arras has created a local dynamic around the Maisons des 1 000 premiers jours®. Driven by firm political commitment and a participatory approach, it brings together local stakeholders to support families, promote parental inclusiveness, and meet children’s early needs. Two training paths prepare individuals for the role of facilitator in these centers: a ten-day immersive course run by the association Ensemble pour la petite enfance (Together for Early Childhood), and a university diploma in Lille (not specialized in peer support). Facilitators support families through a community-based, scientific, and collaborative approach. Inter-institutional trust, a shared vision, and strong local engagement underpin the success of France’s Maisons des 1 000 premiers jours®. This public health initiative supports families, strengthens bonds of attachment, and tackles inequalities from birth through a collaborative and preventive approach.