Final answer:
Cognitive development in a 2-year-old child is characterized by using words, following commands, and understanding physical relationships.
Step-by-step explanation:
Cognitive development in a 2-year-old child is characterized by several milestones. At this age, a child can use as many as 50 words and generally understand at least a couple of hundred more words. They can also obey simple verbal commands, help dress and undress, and understand physical relationships like flipping a switch.