Under normal circumstances, exclusively breastfed babies usually do not need to be fed extra water, unless some special circumstances, such as when the baby is sick or the ambient temperature is too high, losing more body fluids, when taking medication or when there is a suspicion of more fluid loss and sweating, you can feed water appropriately. However, it should be noted that the intake of water should not be too much to avoid affecting the baby’s overall milk intake, otherwise it will easily cause unsatisfactory weight gain. Usually the mother’s diet should be light and easy to digest, and under normal circumstances to ensure the intake of breast milk, usually can ensure the baby’s daily water needs. When the environment is dry and the temperature is high, and the baby feels that the water requirement is high, it is usually possible to replenish the insufficient water by increasing the amount of mother’s breast milk, for example, by increasing the number of feedings.