Which verbal milestone should a 2-year-old achieve?

A 2-year-old typically achieves the milestone of using two to four-word sentences, which indicates a significant advancement in language development. At this age, children begin to combine words to form simple sentences, which allows them to express more complex ideas and needs. This milestone reflects the expected progress in their vocabulary and grammar, as they not only expand their word count but also start to understand the basic rules of sentence structure.

In comparison, one-word utterances are expected at around 12 months to 18 months, reflecting an earlier stage of language development where children communicate basic needs or thoughts with single words. Full conversations represent a level of linguistic skill that is typically seen in older children, while nonspecific babbling is characteristic of much younger infants who are just beginning to explore sounds and vocalization.