FIGURE 9.3 Milestones in Infant Motor Development Each bar in the graph shows the typical range of ages for acquiring a particular motor skill during infancy. Given the wide range of individual variation, can you see how simple statistical averages may be misleading?
[a] Bubbles Photolibrary/Alamy [b] Image Source/Getty Images [c] Brand X Pictures/Punchstock
[d] Katie Moss/age fotostock [e] JUPITERIMAGES/BananaStock/Alamy
[d] Katie Moss/age fotostock [e] JUPITERIMAGES/BananaStock/Alamy