Should parents worry if baby doesn't laugh?

Before babies have the words to tell us what they're thinking, they can laugh. Developmental psychologist Gina Mireault, PhD, explains how she sets up a “baby comedy club” in her lab; what babies find funny and why; when babies start trying to make other people laugh; and what studying laughter can tell us about babies’ cognitive development and how they experience the world in their first year of life.

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