“How long does anemia last in a child?”

There are many causes of anemia that range from transient to chronic. Differential diagnoses include anemia from infection, bleeding, nutritional deficiencies, and even malignancy. He should meet with a physician for a formal evaluation with blood work to determine the cause and management.

I am not a pediatrician, but anemia in a child is usually nutritional. If his pediatrician cannot find the cause, he may need a referral to a hematologist. As he matures, the anemia should resolve.