Whether an infant needs to be fed water depends on the specific situation. Usually infants who are exclusively breastfed or formula-fed before 6 months of age do not need extra water, and infants who are given complementary foods around 6 months of age can be given a small amount of water to meet their body’s needs. Due to exclusive breastfeeding or formula feeding, infants before 6 months of age are able to consume sufficient water from breast milk or formula, which can satisfy the infant’s need for water and maintain normal growth and development. Supplementing with extra water will easily increase the burden on the kidneys and affect the kidney function which is not yet well developed. Infants around 6 months old have gradually started to add complementary foods, with the gradual increase in the age of the month, the body’s demand for water is relatively increased, a small amount of water supplementation every day can promote the development of various organs and systems, which is beneficial to health. Especially in the hot summer, a small amount of water between meals can promote metabolism and prevent heat stroke. Parents are advised to pay attention to the water temperature and the amount of water when feeding water to infants, to ensure that babies are fed safely, and to seek prompt medical attention when discomfort occurs, so as not to delay the condition.