Babies may begin to smile around 2 months and chuckle around 4 months. By 6 months, they'll be laughing up a storm. You can ...

Let’s explore the typical development milestone timeline, learn why researchers say babies laugh, and explore when you might want to consider a doctor’s appointment to check in on any delays.

What makes babies laugh? It sounds like one of the most fun questions a researcher could investigate, but there's a serious scientific reason why Caspar Addyman wants to find out.

A couple watching a baby laughing. Some babies require more stimulation, while others respond better with a gentler approach to make them laugh. iStock/Getty Images Plus Humor involves several ...

So far, 1,400 parents from 25 countries have answered questions ranging from whether their baby was more likely to laugh at a particular time of day to which toys and nursery rhymes they found ...

Smiling, laughing, and crying are therefore crucial to interacting with the rest of the world. You probably won’t catch a baby laughing all by herself. “It’s a social response,” Mireault says.

It’s not clear why babies and chimpanzees laugh in this way. But laughter and laugh-like vocalizations in humans and non-human primates both probably evolved from common ancestry.

Infants and younger babies laugh as a result of physical play like tickling. This is the same for older humans, but many kinds of social interactions, for example, jokes, can also elicit laughter.

Since 2012, I have been studying laughing babies. The question I am most often asked—frequently accompanied by incredulous laughter—is “Why?” And sometimes, “Wouldn’t it be better to ...

An exciting milestone your baby will reach is starting to laugh. Find out when to expect some giggling and how to encourage their laughter.