A kindergartener can bounce the ball, and throw it at targets and baskets. If the same ball has survived until first grade, you not only have your money's worth, but you have the ball for a back yard game of kick ball. An understanding of which toys are appropriate for which age is useful when toy shopping. Age appropriate toys are toys that will challenge the child without frustrating her. They are toys the suit the skills the child has, and the skills he will be developing in the near future.
Older infants can sit up and explore their worlds, which gives their toys a new perspective.
You may not need to add many new toys at this stage. Their own bodies are fascinating enough to them. Children at this stage like to make things happen - they like to push a button and hear a song, or have a bird pop out of the window. Children at this age begin to engage in imaginative play, and it is focused on learning about their world. Play becomes more social and more involved at this age.