It is a common misconception that shaking breast milk is harmful to the nutrients and that it is better to swirl. The truth is, there isn’t any evidence to support the claim that shaking is harmful and that you should swirl breast milk. To ensure you are effectively dissolving Ready. Set. Food!, shake the bottle for at least 5-10 seconds prior to feeding. Parents have shared feedback that adding Ready. Set. Food! to the bottle and shaking it before warming helps the powder dissolve.