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The development of ultrasound techniques opened a window on the prenatal world. Since the early 1990s, bidimensional ultrasonography has played an important role in the study of certain fetal behaviours in attempts to understand fetal well-being. Certain fetal attitudes can be likened to those subsequently seen in newborns [1]. Study of fetal circulation by Doppler ultrasonography in parts of the fetal body such as the middle cerebral arteries has also clearly shown that certain pathophysiological and pathological conditions cause a redistribution of normal fetal circulation, indicating a change in fetal status. [ABSTRACT FROM AUTHOR]