We decided to start Evivo for our 3-month old daughter as she had been having some bouts of colicky pain. After about a week of taking Evivo the pain seemed to subside, although we have to say that her gas smells a lot worse now! Whether or not the colic went away on it's own or the Evivo helped we can't confirm, but we do believe the downstream effects of the antibiotics are worth keeping up with the daily doses.