American infants a. are less likely to experience colic than are babies in non-Western cultures. b. typically experience colic until they are about a year of age. c. show the same frequency,...

American infants

a. are less likely to experience colic than are babies in non-Western cultures.

b. typically experience colic until they are about a year of age.

c. show the same frequency, intensity, and duration of crying as babies from all over the world.

d. have been found to cry more than babies from cultures where they are held or carried for much of the day.