Final answer:
Babies undergo several language milestones during their first year of life, starting with cooing and babbling and eventually saying their first words for meaning.
Step-by-step explanation:
Babies undergo several language milestones during their first year of life. Around nine months, they start a rapid process of language learning, proceeding through stages that allow them to learn language by being exposed to surrounding talk. They begin by cooing, then move on to babbling, and by about 12 months, they start saying their first words for meaning. This process continues as they develop their language and communication skills.