The first 1000 days between conception and a child's second birthday provide the greatest opportunity to positively impact long-term development through nurturing care. During this period, the brain grows rapidly and is shaped by environments and relationships. Proper nutrition, health, stimulation and parenting can influence cognitive, physical, social and psychological development. Ensuring children receive responsive caregiving, good nutrition and healthy supportive environments during these critical first 1000 days lays the foundation for their future growth, learning and well-being.