Stage 3 Mix-Ins are recommended for babies who are consistently eating solids. Because of the number of allergens, it can clump and block the flow of the bottle. We recommend mixing Stage 3 Mix-Ins with your baby's favorite soft food such as yogurt, oatmeal, rice cereal, or purees. If your baby is not consistently eating solids, Stage 1 and 2 Mix-Ins are the best way to feed your baby the most important allergens through a bottle of breast milk, or formula.