We (meaning she obviously) have been very good about pumping storage following all the rules and guidelines on storing milk. However, recently the babysitter brought us a bag of the milk we had been giving her with around 40-50 oz of breast milk. She was so upset that the sitter had all this milk that was thawing and hadnt been used. Do we just throw all this milk away? what are the major issues with refreezing the milk after it as started to thaw? What type of damage will that do to our son?