Contact: Jyoti Madhusoodanan
Public Library of Science
Caption: This is an ultrasound showing yawn 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
Usage Restrictions: With credit to source
Related news release: Ultrasound pictures show difference in fetus yawning and other mouth openings