The 1,000 day window, between a mother’s pregnancy and her child’s second birthday, is a critical time that helps set the stage for the child’s future well-being. During this period, proper nutrition is crucial for supporting rapid brain development, building the immune system, and other essential functions. 1,000 Days, with support from Zero to Three and their Think Babies Campaign, has created this resource, Nutrition in the First 1,00 Days, to focus on the importance of investing in nutrition during this foundational period.