According to the USDA guidelines for storage of breastmilk, it should be treated as any other perishable food and not kept out of refrigeration for more than 2 hours, 1 hour above 90 F. However, some of the information I have seen from other sources indicate that bm can be left at room temperature for up to 8 hours. I have some concerns about this recommendation, especially in the summer time and also since many of our clients have poor sanitation habits. So, I am conservative and continue to recommend to the breastfeeding counselors in our project to tell moms to keep breastmilk refrigerated....not sitting out at room temperature more than 1-2 hours. I would love to hear what other lactnetters think about this. tia, Laura Aldag