Number of blocks a child can stack Is equal to age in years times 3:
1.5 year old can stack 4.5 blocks ~ 4 blocks
2 year old can stack 6 blocks
3 year old can stack 9 blocks
Shapes that a child can draw follows alphabetical order, except diamond which is the last and most complicated for a child: circle, cross, rectangle, square, triangle, and diamond (each one corresponds to a particular age)