Changes in your milk supply will occur within one to three days after changes in milk demand or use. Use containers that have been washed in hot, soapy water and rinsed well. Always date the milk before storing it. Fresh breast milk can be kept at room temperature up to 10 hours, and refrigerated 24 to 48 hours. Frozen and thawed milk can be refrigerated for up to 9 hours but should not be refrozen.
Plastic containers are the best for storing breast milk.
Refrigerated milk and frozen milk should be warmed under a stream of warm tap water.