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Previous Volume 336:1329-1331 May 1, 1997 Number 18 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: Regarding the interpretation of the Image in Clinical Medicine entitled "A Fetal Yawn" (Nov. 14 issue)¹ showing an ultrasonogram in which a 34-week-old fetus is reported to be yawning, the literature fails to define yawning in a fetus, with the result that far too many interpretations of open mouths as yawns have been accepted.^2,3 The range of variation includes, for example, a single, continuous opening of the mouth lasting three minutes² and a set of five repetitive openings of the mouth for four to six seconds each.³ There is also a discrepancy in the use of the . . . [Full Text of this Article]

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