This article presents a seminar on croup which is the barking cough that young children get that frightens many parents. The disease mainly affects very young children with boys more likely to get it than girls. Symptoms tend to worsen at night and fluctuate with the child's agitation level. Most croup cases are caused by an upper-airway infection. The author offer advice on how to diagnose croup to what signs to look for if the patient is suffering from a more serious disease. Treatment options are presented with the most popular being corticosteroids and epinephrine via nebuliser.