The parents of a 3-month-old ask the nurse what behaviour they should expect. The nurse informs the parents that the child will be able to do which one of the following?
a. Saying "Da-da"
b. Smiling responsively
c. Differentiating between a stranger and a familiar person
d. Playing peek-a-boo games
B
Between 2 and 3 months of age, infants begin to smile responsively rather than reflexively.
By age 1 year, infants have two- or three-word vocabularies, such as "Da-da."
By 8 months of age, most infants can differentiate a stranger from a familiar person.
By 9 months of age, infants play simple social games such as patty-cake and peek-a-boo.
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