The 1st 1000 Days period is critical for the development of metabolic function and lays the foundation for lifelong metabolic health. Optimal growth in this period reduces the risk for obesity and associated non-communicable diseases later in life. Therefore, nutrition in early life has the power to influence lifelong health. Infants and young children need adequate nutrition for physical, metabolic as well as cognitive development. Breastfeeding is the preferred sole source of nutrition during the first about 6 months of life, with continued partial breastfeeding thereafter, and supports healthy growth and development.