Contact: Jyoti Madhusoodanan
Public Library of Science
Caption: The ultrasound image shows mouth opening at 27.5 weeks gestation.
Credit: Citation: Reissland N, Francis B, Mason J (2012) Development of Fetal Yawn Compared with Non-Yawn Mouth Openings from 24–36 Weeks Gestation. PLoS ONE 7(11): e50569. doi:10.1371/journal.pone.0050569
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Related news release: Ultrasound pictures show difference in fetus yawning and other mouth openings