Young children everywhere need sufficient nutrition and stimulation to grow and develop appropriately. A healthy, diverse diet and a supportive caregiving environment can help children grow and develop in their early years, and also make children more likely to succeed later in life. Across low income countries, however, hundreds of millions of children don’t get enough healthy food for their bodies and brains to develop fully, putting them at a disadvantage starting from an early age. With so many children at risk of stunted growth and development, policymakers are urgently seeking effective and scalable approaches to improve children’s outcomes.