Yawning Fetuses Are Already Over It

More

New evidence that they're not just opening their mouths really wide

fetusyawn1.jpg
PLoS One

One of these ultrasound images show a fetus yawning, while in the other, it's simply opening its mouth. But from static images like this, it's next to impossible to tell which is which.

Using 4D scans, researchers at Durham and Lancaster Universities announced that were able to clearly differentiate mouth stretches from yawns. With yawns, according to new metrics that they've developed, it takes longer for the fetus to stretch its mouth to its fullest:

yawns615.jpg

The yawn's climax, so to speak, occurs seven frames in. 

The jury's still out on what business an unborn baby has yawning in the first place. Yawning doesn't become contagious until around the age of five, and they're pretty isolated in their amniotic bubble, so they're probably not trying to communicate. It's also unlikely that they're expressing sleepiness.

But since it would have been a shame not to publish these adorable In(utero)stagrams, the researchers went ahead and suggested that yawning might be a developmental process. This is backed up by their findings that the frequency of yawning appears to change throughout the fetuses' maturation, peaking at 28 weeks. Based on the timing, it's probably related to brain maturation. Maybe they're developing their irony center.

Jump to comments
Presented by

Lindsay Abrams is an assistant editor at Salon and a former writer and producer for The Atlantic's Health Channel.

Get Today's Top Stories in Your Inbox (preview)

What Is the Greatest Story Ever Told?

A panel of storytellers share their favorite tales, from the Bible to Charlotte's Web.


Elsewhere on the web

Join the Discussion

After you comment, click Post. If you’re not already logged in you will be asked to log in or register. blog comments powered by Disqus

Video

The Death of Film

You'll never hear the whirring sound of a projector again.

Video

How to Hunt With Poison Darts

A Borneo hunter explains one of his tribe's oldest customs: the art of the blowpipe

Video

A Delightful, Pixar-Inspired Cartoon

An action figure and his reluctant sidekick trek across a kitchen in search of treasure.

Video

I Am an Undocumented Immigrant

"I look like a typical young American."

Video

Why Did I Study Physics?

Using hand-drawn cartoons to explain an academic passion

Writers

Up
Down

More in Health

Just In