At what age do infants' cries become sufficiently differentiated that a familiar adult can know if the infant is hungry, in pain, or experiencing some other form of distress?

Question

Quizplus · Accepted Answer

Research suggests that by about 3 months of age, infants' cries become differentiated enough that familiar adults can distinguish between hunger, pain, and other forms of distress.

At What Age Do Infants' Cries Become Sufficiently Differentiated That