Breastmilk placed in a 40 ℃ milk warmer for a few minutes to half an hour can drink, and the shorter the time the better, at most not more than 2 hours. Breastmilk stored at a constant temperature of 40℃ in a milk warmer is convenient for feeding your baby at any time, but it is more conducive to the growth and reproduction of various microorganisms, making the time of milk storage significantly shorter, generally more than 2 hours to deteriorate. It is recommended to drink it within 30 minutes, preferably no more than 60 minutes, to avoid the loss of nutrients or deterioration of breast milk. It is important to note during the use of a milk warmer that breastmilk can be heated before feeding. Unfinished breastmilk should be dumped in time to avoid repeated heating. At the same time, make sure to disinfect bottles and milk warmers regularly to ensure cleanliness and hygiene. In general, if the mother has sufficient breast milk, it is recommended to give the baby a hand-feed to facilitate parent-child communication. However, if breast milk needs to be stored for a longer period of time, it can be placed in a milk storage bag and stored in an environment below 15°C.