I tried Evivo because my 4 week old was having very frequent, watery stools. My pediatrician was not concerned, but I knew something wasn't right. A few days into using Evivo her stools became less watery and over the course of the next week, much less frequent! She has been on Evivo for 5 months now and is doing great! She has gained weight and grown into a strong, healthy baby despite being only 5lbs at birth. I recommend Evivo to all the new mothers I meet!