Our specialist warned us of the taste of the hypoallergenic formulas. Also, they seem to be thinner than other formulas, so they are able to digest them better. Maybe I’m wrong on this, just my thoughts. When we switched from soy to Ailamentum, I did it gradually. An ounce at a time in her bottle. This helped her to adapt to the taste. Also, I would give it a about a week to see results. From our experience, Ailamentum didn’t work, so we switched to Neocate. And wow, what a happy baby! Good luck!