Iron Deficiency Anemia with Eosinophilia: The patient's lab results show iron deficiency anemia (low Hb, low MCV, low MCH, low MCHC) along with eosinophilia (9% eosinophils). Eosinophilia can be seen in various conditions, but in the context of iron deficiency anemia, it might be related to a parasitic infection or an allergic reaction. However, the presence of fever and elevated CRP suggests an infectious or inflammatory process.

Acute Infection (e.g., Bacterial or Viral): The patient's fever, elevated CRP, and eosinophilia could indicate an acute infection. The elevated white blood cell count (TLC 14100) further supports this possibility.
Allergic Reaction or Atopy: Eosinophilia is often associated with allergic reactions or atopic conditions. Given the patient's age and the presence of eosinophilia, an allergic reaction could be a contributing factor.
Parasitic Infection: Parasitic infections, such as hookworm or roundworm infestations, can cause iron deficiency anemia and eosinophilia. The patient's age and potential exposure to parasites make this a plausible diagnosis.

Malignancy (e.g., Leukemia): Although less likely, malignancies such as leukemia can present with anemia, thrombocytopenia (low platelet count), and eosinophilia. It is crucial to rule out malignancy due to its severe implications.
Severe Infection (e.g., Sepsis): The combination of fever, elevated CRP, and abnormal blood counts could indicate a severe infection like sepsis, which requires immediate attention.
Autoimmune Disorder: Certain autoimmune disorders, such as systemic lupus erythematosus (SLE), can present with anemia, eosinophilia, and other systemic symptoms. Although rare in a 2-year-old, it is essential not to miss this diagnosis.

Primary Immunodeficiency: Conditions like Hyper-IgE syndrome can present with eosinophilia, anemia, and recurrent infections. These are rare but should be considered if common diagnoses are ruled out.
Lymphoma: Although very rare in a 2-year-old, lymphoma can cause anemia, eosinophilia, and systemic symptoms. A thorough diagnostic workup is necessary to rule out such conditions.

To proceed, a comprehensive diagnostic approach should include:

Detailed history and physical examination
Complete blood count (CBC) with differential
Blood smear examination
Erythrocyte sedimentation rate (ESR) or C-reactive protein (CRP) to assess inflammation
Iron studies to confirm iron deficiency
Stool examination for parasites
Allergy testing if an allergic reaction is suspected
Imaging studies (e.g., chest X-ray, ultrasound) as indicated
Bone marrow biopsy if malignancy is suspected
Consultation with a pediatric hematologist or immunologist for further guidance.