Children under 4 and children with autism don't yawn contagiously

If someone near you yawns, do you yawn, too? About half of adults yawn after someone else does in a phenomenon called contagious yawning. Now a new study has found that most children aren't susceptible to contagious yawning until they're about 4 years old - and that children with autism are less likely to yawn contagiously than others...

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