Our warming bowl is the optimal warming product for breast milk. Health professionals and the World Health Organization recommend that you only warm breast milk in a bowl of warm water to prevent overheating (which can lead to nutrient damage) and hot spots from forming. Thanks to its unique geometry, it warms both Nanobébé bottles and breastmilk bags two times faster than other warmers on the market at safe temperatures protecting precious nutrients.It is also the only eco-friendly warmer on the market (because helping to preserve our environment for our future generations is great). No electricity, no settings, and zero fuss!