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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.
The more the aorta is narrowed, the more severe the symptoms will be. In infants where the coarctation of the aorta is severe or moderate, symptoms can include: 1  Labored or rapid breathing.  Weak femoral artery pulse (taken in the groin area)