Puree with breastmilk

Hi mummies, my baby is 5m old. I would like to start feeding her puree and 5.5months as she's showing interest in food whenever she see us eating. but i would like to know if i were to add breastmilk into the puree, can i mix with cold refrigerated breastmilk (not frozen) ? Or do I've to warm the breastmilk before adding it?