Question

An $11$-month-old female infant presents to the pediatric outpatient clinic during the winter season accompanied by her parents. They report a $4$-day history of copious nasal discharge and a worsening, wet-sounding cough. Over the past $24$ hours, the parents noted an increased work of breathing. During the visit, the parents also mention they are worried because the infant is not yet walking independently, although she pulls herself to a stand and cruises along the furniture. She babbles and says "mama" and "dada" specifically. Her temperature is $37.7^\circ\text{C}$ ($99.9^\circ\text{F}$), heart rate is $142/\text{min}$, respiratory rate is $48/\text{min}$, and pulse oximetry is $96\%$ on room air. Physical examination reveals clear nasal secretions and mild subcostal retractions. Lung auscultation demonstrates diffuse bilateral expiratory wheezes and scattered coarse crackles. Cardiovascular examination is normal. Which of the following is the most appropriate next step in the management of this patient?