Ask an expert and they will tell you you don't need a bottle warmer. However, if your screaming happiness package refuses to take too cold formula or expressed breast milk at 3 a.m., you may be different. Place the bottle in one of the heaters and you will receive a ready-to-use bottle at the right temperature within a few minutes. Not only do these gadgets get the job done quickly, but they also ensure that the milk doesn't heat the milk bottle in the microwave or boiling water, which could…