Babies born with laryngomalacia—a type of birth defect— make a noisy sound when they breathe. In fact, this condition is the most common cause for your infant's noisy breathing.

Symptoms of laryngomalacia may resolve when the infant is 18 to 24 months old. ... Croup is an inflammation of the larynx and trachea in children, recognizable by its distinct cough.

In infants, a condition called laryngomalacia is usually the cause of stridor. ... This test checks material you or your child cough up from the lungs for viruses and bacteria.

BOSTON — Wheeze, stridor and cough are among the most common sounds made by children with respiratory conditions, but they are often misidentified, especially in the emergency department ...