Severe Preventable Iron Deficiency Anemia Driven by Excessive Cow's Milk Intake in Early Childhood

Background

We report a previously healthy pediatric patient who presented to our Emergency Department in apparently good general condition despite a critical hemoglobin value of 3.4 g/dL, which is normally a life-threatening value. The patient was previously seen by her primary care pediatrician during well child visits.

Case Presentation

A 16-month-old girl, previously healthy, presented to our Emergency Department with a 2 weeks history of progressive pallor, fatigue and decreased oral intake. At admission, the CBC showed a severe microcytic anemia, with a critical hemoglobin value of 3.4 g/dL, MCV of 60.5 fL and RDW 28.4%.The iron panel showed an iron deficiency with low ferritin of 3 ng/mL and iron level at 25.8 ug/dL. She was previously seen by her primary care pediatrician during the 12-months well child visit and hemoglobin was reported normal. On clinical examination, the patient’s skin and mucous membranes were markedly pale, she was tachycardic and with a systolic cardiac murmur. The anamnesis highlighted the presence of an excessive cow’s milk consumption, with a total intake of 40 oz daily, including milk and dairy products. An echocardiogram did not show structural abnormalities and the occult blood in stool was negative. We ruled out other possible causes of iron deficiency anemia. She received two transfusions of packed red blood cells and subsequently intravenous iron preparations (total amount 50 mg) followed by oral iron supplementation. The Hb value at discharge was 6.9 g/dL.

Key findings In this patient, the most likely cause of her current clinical presentation is due to excessive whole cow’s milk intake. Excessive whole cow’s milk consumption is the most common dietary cause of iron deficiency anemia in toddlers, typically between 12 to 36 months. It produces a microcytic, hypochromic anemia through different mechanisms. One of them is that it contains very little bioavailable iron and high volumes create early satiety and displace iron rich solid foods. Additionally, calcium blocks the DMT-1 channel and casein binds iron to form a non absorbable complex, reducing the absorption. Management consists of dietary modification, such as limiting total milk consumption to 16 oz per day, including all dairy products. Pediatricians should encourage iron-rich foods, especially in this age group or include oral supplementation with elemental iron.

Conclusion

When approaching a well child visit, routine, structured dietary screening should be considered to prevent severe nutritional complications. We suggest pediatricians ask detailed information about the amount of food ingestion in each group of age and include laboratories if needed. This type of microcytic anemia caused by iron deficiency secondary to an incorrect diet can be prevented in well child visits, providing the right supplementation on time. This case highlights that milk overload is a preventable risk factor capable of causing severe, life-threatening anemia requiring emergency intervention and anticipatory guidance regarding strict milk limits during early well-child visits.