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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.
Stridor in infants is not normal. 1  It is a symptom of airway obstruction. The following three characteristics are believed to be most important in the assessment of stridor in neonates. Attention to these qualities often helps in formulating a correct differential diagnosis16: 2  Volume. 3  Pitch. 4  Phase.