Our son was given vitamin d drops when he was 8 weeks old. After one dose, and many many hours of constant crying and awful pains in him, he began spitting up after every breastmilk bottle. A friend of mine suggested trying Evivo and I put it off until one day he was spitting up everything he was eating. The shipping was VERY fast and came cold. He went from spitting up multiple times a day to only spitting up when he over eats. Evivo completely restored his gut flora and he is now having bowel movements on the dot, every day.