From formula to pureed carrots, baby food is a massive -- and necessary -- industry. Each year millions upon millions of families search for the best, most nutritious food to feed their children, and there's no shortage of advice from experts and parents alike. However, it appears there's a secret to this industry: Numerous baby food products contain ingredients parents can't see on the label, including contaminants like mercury, lead, arsenic and more. How long has this been occurring? What did the manufacturers know, and when? Tune in to learn more.