What is the primary source of nutrition for infants during the first 6 months of life?

Breast milk or formula is the primary source of nutrition for infants during the first 6 months of life because it provides all the necessary nutrients that a newborn needs for healthy growth and development. Breast milk, in particular, is tailored specifically for human infants, containing the right balance of proteins, fats, carbohydrates, vitamins, and minerals. It also includes antibodies that support the infant's immune system, which is especially important in the early months when their immune system is still developing.

Infant formulas are designed to closely approximate the nutritional composition of breast milk, making them a suitable alternative for families who may not breastfeed. Both breast milk and formula are easily digestible for infants, helping to reduce the risk of gastrointestinal problems.

Introducing solid foods or other liquids such as cow's milk or vegetable juices too early, before 6 months, is not recommended as they do not provide the complete nutritional profile that infants need and could also introduce potential allergens or digestive issues. Solid foods generally should start being introduced after 6 months to complement the nutrients provided by breast milk or formula. Hence, breast milk or formula is the only safe and appropriate source of nutrition during this critical period for infants.