A family member who is a pediatrician recommended that I look into Evivo when my daughter was born, because the bacteria that would help her reap the full benefits of my breast milk may not be in her gut to begin with due to modern medicine like antibiotics. I asked for a 4 month supply of Evivo as a birthday gift for myself. We started using it when our little girl was 4 months old, and she seems to be doing really well with it!