Children progress through several stages in acquiring their first language from birth to age 12. These stages include babbling, first words, two-word phrases, developing phonological and syntactic norms, and conversational skills. There are differing views on how first and second languages are acquired, including behaviorist, nativist, cognitive-developmental, and social-interactionist perspectives. While first and second language acquisition share similarities like practice and imitation, they also have differences such as context and motivation. Younger children may have an advantage in pronunciation but other factors also influence language learning outcomes.