Delta Airlines infant baggage policy allows parents to bring necessary items for their infants without additional charges. In addition to a carry-on bag, parents can bring a stroller and car seat for free. Infants under 2 years old who are traveling on an adult’s lap are allowed to bring a diaper bag, and the airline allows you to check a car seat and stroller at no extra cost. When booking, it's always a good idea to confirm the details, as policies may vary slightly depending on the route or destination.