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The third year of a child's life is a milestone year. This is the year your child moves from being a toddler to a preschooler, according to the National Network for Child Care. Suddenly, your child can walk, talk, count and do other "big kid" activities. This does not mean, however, that you should throw an elaborate birthday bash for her. Three-year-olds still have short attention spans. Instead, throw her an age-appropriate party that everyone will enjoy.