Congenital vallecular cyst is fairly uncommon in neonates and infants. Although benign in nature, it may cause stridor and even life-threatening air-way obstruction in early infancy. A 3-month-old male baby presented with failure to thrive and respiratory distress was found to have a vallecular cyst. Marsupialization with CO2 laser was performed. (C) 2002 Elsevier Science Ireland Ltd. All rights reserved.