Breastfeeding provides optimal nutrition for infant growth and development. It protects infants from infection through antibodies and aids in bonding. Common breastfeeding positions include football hold, cradle hold, and cross-cradle hold. Supplementary feeding with expressed breast milk or formula may be needed if the mother is ill or baby is not gaining weight. Cow's milk differs significantly from breast milk in composition and is not recommended as a primary food for infants under 6 months. Weaning involves transitioning from breast or bottle feeding to use of a cup and solid foods.