 This study will be one of three, which include: 1 measuring the airway eicosanoid profiles of pediatric wheezing patients 3 months to 3 years old; 2 determining if genetic variants in eicosanoid metabolic and response pathways are associated with recurrent wheezing; and 3 determining how intervention with montelukast singulair affects symptoms and the rate of recurrent wheezing. 