The Keddle is the only portable bottle warmer that can warm any liquid (including thicker formulas) and breast milk bags. Your Keddle can warm water, breast milk, breast milk bags, formula, and most other liquids. Always add at least 2 oz of liquid to your Keddle before you start warming. If you add less than 2 oz, the Keddle may not detect the correct liquid temperature. It is recommended that you never warm baby’s food above 104°F. Hot drinks can be warmed to 125°F and 145°F. Never warm solid foods or drinks with honey mixed in. Note that warming silicone breast milk bags can be difficult because they do not transfer heat very well and they can be difficult to insert into the Keddle. Warm between 2oz and 10oz of liquid. The more liquid you warm, the more battery power will be used.