I chose Evivo because my son had antibiotics during a hospital stay at 13 days old and I also had antibiotics during delivery for Group B Strep. I was concerned that between the two antibiotics, his gut was wiped out. Before my son started using Evivo, he was pooping about 6 times a day and had a constant diaper rash. Now that we've started using Evivo, he only poops every other day and his diaper rash is completely gone because of it. I'm so glad that I learned about Evivo because I know now that my son is getting the best start in life!