What characterizes the two-word stage in language development?

The two-word stage in language development is marked by the use of simple sentences that consist of just two words. This stage typically emerges around the age of 18 to 24 months, when children begin to combine words to express more complex ideas and needs. For example, a child might say "want cookie" to indicate a desire for a cookie, rather than just saying "cookie" or "want."

During this period, children demonstrate an understanding of syntax and can convey meaning through limited vocabulary, showcasing their capacity for language amidst developing grammatical rules. This stage reflects a significant leap in cognitive development, where children start to use language functionally to communicate their needs and desires. Thus, the defining characteristic of this stage is indeed the formation of simple sentences with two words.