What are the consequences of pulmonary eosinophilia in a child?

Asthma attacks?: Pulmonary eosinophilia can be seen in a number of diseases, but is most commonly seen in asthma, where levels of eosinophils and their byproducts correlate with disease activity. Asthmatics can develop fixed changes in the airways, called remodeling, but the role of the eosinophil in this process is debatable. The primary risk associated with increased eosinophila in asthma is exacerbations.

Depends on the cause: Allergic reactions, asthma, parasitic infections, vasculitis (inflation in blood vessels), tuberculosis, fungal infections, eosinophilic pneumonia and rarely cancers can cause this. With each condition treatments and consequences would be different.