Freshly expressed breast milk can be kept at room temperature for up to six hours. However, it's optimal to use or properly store the breast milk within four hours, especially if the room is warm. Insulated cooler. Freshly expressed breast milk can be stored in an insulated cooler with ice packs for up to one day.
The milk will start to spoil and the baby may get sick from it. Though it is recommended to leave the milk outside of the fridge for as little time as possible.
