Generally speaking breastfeeding does not require extra water, but water can be given if the weather is too hot or if water is lost due to diarrhea or other reasons. Because breast milk contains a certain amount of water, which can meet the infant’s daily needs, there is generally no need to give the infant extra water. However, if the summer is too hot, or if the infant has diarrhea or other conditions that lead to loss of water in the body and symptoms such as oliguria, proper hydration is needed to avoid dehydration. In the process of feeding the baby, we should observe the baby’s condition in time, and when we need to feed water, we should feed water in time, replenish water, avoid the occurrence of water electrolyte disorders, and need to actively diagnose and treat the discomfort.