If your baby is a preemie, you can still start Ready, Set, Food! as early as 4 months (normal age or number of days since born, it is not necessary to go by the adjusted age). The USDA Dietary Guidelines Report recommends that all babies start early allergen introduction beginning as early as 4 months. To learn more about the USDA recommendations for starting early allergen introduction, read our report summary on our blog. If you have any questions, please contact our customer support team for further assistance.