Breastmilk can be put in the 40 degree thermostat heater for 2 hours, it is best to drink within an hour. Constant temperature heater can play a role in insulation, but not to play a role in preservation, breast milk in 40 degrees constant temperature heater, such as more than 2 hours easy to deteriorate, bacteria are easy to reproduce, the baby drink easy to cause nausea, vomiting, diarrhea and other gastrointestinal discomforts, so it is recommended to drink up within 1 hour, such as wanting to be well preserved the best freezer. Generally speaking, breast milk can be stored for 24 hours at 15 degrees room temperature and 6 hours at 25 degrees room temperature. It is recommended that mothers try to let their babies drink fresh breastmilk, if breastmilk needs to be put on the thermostat to keep warm, it is best to drink within 1 hour, in addition to bottles, thermostats, etc. should be frequently and regularly sterilized, and can not be put many times unfinished breastmilk feeding together.