[header] How to shrink adenoids [title] Take your child to the doctor for an exam. [step] Your child's pediatrician may be able to determine an underlying reason for your child's enlarged adenoids and suggest a treatment. Enlarged adenoids can have many causes, but common ones include : [substeps] A viral infection, like a flu or cold. 
An allergic reaction to food or something in the air. A bacterial infection in the throat or upper respiratory system.