Product features: 1. Size recognition, which can be arranged from large to small, and has functions similar to nesting dolls, and the small can be nested into the large; 2. How much cognition, the surface of the product has from 1 to 5 bumps, and in the process of playing, you can learn how many points; 3. Building block stacking function, accessories of different sizes can be stacked, similar to the way building blocks are stacked 4. Puzzle shape puzzle cognition
