Final answer:
A 12-month-old child typically starts saying their first words and can understand several other words. They can follow simple commands and use gestures or words to refer to objects or actions.
Step-by-step explanation:
By 12 months old, a child typically begins to say their first words.
They may have a vocabulary of one- and two-syllable words and can understand several other words.
At this age, they can follow simple commands and use gestures or words to refer to objects or actions.