^a)Respiratory symptoms: cough, rhinorrhea, and nasal obstruction. ^b)Gastrointestinal symptoms: vomiting, diarrhea, and abdominal pain. ^c)Symptoms of anemia: pallor, night irritability (≥2 arousals and/or cries), and pica. ^d)Miscellaneous: the presence of a neck mass, cellulitis, hernia, etc. ^e)Bleeding: epistaxis, melena, and hematuria.

Abbreviation: IDA, iron deficiency anemia.