Incidental fetal yawning movements can rarely be observed during real‐time ultrasonographic examination. In this report we document repetitive fetal yawning movements in a 27‐week fetus over a 7‐min period. Each episode lasted for 4–6 s, and the intervals between them varied from 21 to 195 s. This case demonstrated that fetal yawning, a complex involuntary behavioral reflex, is present in its full extent during the second half of pregnancy.
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Sepúlveda et al. (1995) studied this question.