1. What is three-stage milk powder? What are the advantages of Stage 2 and Stage 3 milk powder? 3. Who is suitable for the third-stage milk powder? 4. How to correctly choose and use three-stage milk powder? 5. What are the common three-stage milk powder brands? 6. What are the controversies and risks associated with the third-stage milk powder? 1. What is three-stage milk powder? Three-stage milk powder refers to formula milk powder suitable for babies 6-12 months old. It usually includes 3 different stages, namely stage 1 (0-6 months).