1. Language development in children occurs in stages, starting with babbling followed by one-word, two-word, and telegraphic stages.
2. The babbling stage involves experimenting with sounds from birth to 12 months, then relating sounds to objects.
3. The one-word stage uses single words like "play" from 12-18 months, the two-word stage combines two words like "doggie walk" from 18-24 months, and the telegraphic stage uses minimal but grammatically correct sentences from 2-3 years old.