Walking up and down stairs using 2 feet per step | 2 years |
Walking upstairs with one feet per step and coming down with 2 feet per step | 3 years |
Walking upstairs and downstairs both using only one feet per step | 3-4 years |
3 cubes | 15 months |
4 cubes | 18 months |
6 cubes | 21 months |
7 cubes | 24 months |
9 cubes | 30 months |
10 cubes | 36 months |
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