Breastmilk is not recommended to be heated a second time. If you don’t feed your baby breastmilk immediately after expressing it, you need to refrigerate or freeze it, and heat it appropriately before feeding it, but generally the second heating will lead to a certain loss of nutrients, and it is not recommended to heat it a second time, otherwise it will lead to a large loss of nutrients, and in the process of storing as well as heating it may lead to bacterial infections. The baby is relatively small, gastrointestinal function development is not perfect, it is easy to eat the second heating of the breast milk after the symptoms of discomfort. Breastmilk as much as possible to the baby to eat fresh, if it is not convenient to breastfeeding, can be given to the baby to heat once can, generally not recommended to heat the second time.