Which statements about language development in children ages 12 to 36 months are true?

The statement regarding all children 24 months old using pronouns is not universally true across all children at this age. However, it is accurate to say that many children begin to use pronouns around this developmental milestone. Typically, by the age of two, children's language skills are rapidly expanding, and they start to use a variety of words, including pronouns, as part of their emerging speech.

While variations exist in individual development, the statement highlights an important trend that occurs in language use around this age, where children show a notable growth in their vocabulary and complexity of speech. It is important to recognize that not every child will use pronouns at this exact age, as language development can vary widely among children, influenced by factors such as exposure to language and individual development rates.

In contrast, the other statements do not accurately represent typical language development milestones. For instance, children around 18 months generally have a vocabulary of around 10-20 words rather than the approximate 25 suggested. By 24 months, many children may combine words into two- to three-word phrases, not four-word sentences. Finally, while children 36 months old do indeed develop robust vocabularies, the rate of learning five or six new words each day can be an