1,000 Days | 2,765 followers on LinkedIn. Fighting for moms and babies and changing the world, 1,000 days at a time. | 1,000 Days, an initiative of FHI 360, leads the fight to build a strong foundation for mothers, children, and their nations to thrive. The first 1,000 days from pregnancy to age 2 is a window of opportunity that matters for the futures of women, young children, and their societies.