When do infants typically start laughing?

Infants typically begin laughing around 4 months of age, marking a significant development in their social and emotional interactions. This milestone is often associated with the development of their cognitive and emotional skills, as laughter involves both a physical response to stimuli and an ability to recognize and engage with the environment in a socially meaningful way. At this age, babies are becoming more aware of their surroundings and are beginning to interact more intentionally with caregivers and others, which enhances their capacity for joy and playfulness.

Prior to 4 months, infants may display other responsive behaviors, such as cooing or smiling, but these do not encompass the full expression of laughter, which typically includes vocalization and a reaction to something amusing or enjoyable. Understanding this development can be critical for professionals working with deaf and hard-of-hearing infants, as they may rely more heavily on visual stimuli and social cues, impacting their experience of laughter and emotional expression.