By what age should a child be able to speak in simple sentences?

A child typically begins to speak in simple sentences by the age of 2 years. At this developmental stage, children start to combine two words to form basic phrases and communicate more effectively. This is a key milestone in language development, reflecting their growing understanding of grammar and vocabulary.

At around 1 year, children usually say their first words, but these are typically single words rather than sentences. By age 3, children generally progress to using longer and more complex sentences, often containing three or more words, which shows further advancement in language skills. By age 4, children can utilize even more complex grammar structures. Thus, the age of 2 years is crucial for the emergence of simple sentences, making it the correct answer in this context.