At about age 2, which words begin to take on especially important significance to toddlers?

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Around the age of 2, toddlers begin to develop a sense of self, and they start to understand that they are separate individuals from their caregivers. As a result, the words "me" and "mine" become particularly significant to them as ways of asserting independence and control over their environment. They may use these words to stake claim to toys, snacks, or other items that they consider their own.

At About Age 2, Which Words Begin to Take on Especially