Stages 1 & 2 Mix-Ins can be mixed with formula, breast milk, or food. It would be recommended to start with Stage 1 Mix-Ins and then continue with Stage 2 Mix-Ins if your baby is not eating solids. As you transition your baby to solids, you can switch to mixing with purees (e.g., applesauce, pouches, yogurts, etc.). Once your baby is consistently eating solids, you can switch to Stage 3 Mix-Ins Mix-Ins or Organic Baby Oatmeal.