The document summarizes the stages of language acquisition in infants and young children. It discusses how the infant vocal tract develops in the first year and the progression from cooing and babbling to first words and telegraphic speech. It emphasizes creating a language-rich environment by talking, reading, and expanding on the child's words and phrases to help vocabulary growth from 12-18 months. Motivation and confidence in successful language use also reinforce learning in a stress-free environment tailored to the child's needs and pace.