Efficient heat transfer abilities affect both heating and cooling processes. In a previous work , the investigators showed that overheating of EHM is highly probable when using commercially available electrical water-based bottle warmers, even if the manufacturer's recommendations are followed . Besides warming process, EHM stability can also be affected by container composition and shape, storage temperature and whether or not sterilization was effected prior to storage. Following our previous study, the investigators hypothesized that a non-standard storage and warming process may increase EHM preservation. The investigators therefore designed a novel device with larger surface area and narrower milk width in order to minimize temperature gradients within the milk volume.