Between _____ months of age, most children begin to combine words into short sentences while speaking.

Between 18 and 24 months of age, most children begin combining two or more words to form short sentences, a stage often called the 'two-word stage' or telegraphic speech. This is a crucial milestone in language development where children move from single-word utterances to combining words like 'want milk' or 'mommy go'. By age 2, most children have a vocabulary of about 200-300 words and can form simple sentences.