The very first step in choosing activities for your toddler is to make sure that you understand her. You need to be familiar with what toddlers can and cannot do, what they enjoy, and what may frustrate them. You probably know better than to purchase a chemistry kit for your two-year-old or to ask your three-year-old to join you in a game of Gin Rummy. However, you may not know what toys are best to promote problem-solving skills or why sharing can be so difficult for a toddler.