When should montelukast be considered for treating seasonal allergies in children?

Montelukast is a leukotriene receptor antagonist that is effective for managing seasonal allergies, particularly in children. It is often considered when other first-line treatments, such as antihistamines, are inadequate in controlling symptoms. The recommendation to consider montelukast typically begins at the age of 2. This is primarily due to the need for better evaluation of efficacy and safety in children younger than this age, as they may respond differently to medications.

At 2 years old, montelukast can be safely prescribed, and studies have shown positive results in terms of symptom relief for allergic rhinitis. As children typically begin to experience seasonal allergies around this age, starting treatment with montelukast can significantly improve their quality of life during allergy seasons.

The other options involve ages where prescribing montelukast may not be appropriate due to safety concerns or lack of established efficacy in younger children. Thus, 2 years old is the benchmark age for initiation, making it the correct choice.