0-1 month: like to look at shapes, curves and contrasting colors.

1-2 months: like bright colors, and strong black and white contrast.

2-3 months: distinguish yellow, red and orange.

3-8 months: can distinguish two different shades of the same color.

8-12 months: distinguish simple geometric shapes.

1-3 years: began to have more understanding of the near Baby & Toddler Toy  and far, front and back, left and right and other three-dimensional space.

3-4 years: can distinguish red, yellow, blue, green, orange, purple and other basic colors.

5-6 years: gradually recognize all the colors, but stereoscopic function is incomplete.

9 years+: be same as adults basically.