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If increased effort is needed to fill the lungs, supraclavicular and infraclavicular retraction may be seen. In infants, sternal retraction occurs with only a slight increase in respiratory effort, the result of the pliability of their chests. Compare intercostal bulging.
Variable decelerations are irregular, often jagged dips in the fetal heart rate that look more dramatic than late decelerations. Variable decelerations happen when the babyâs umbilical cord is temporarily compressed. This happens during most labors.