A nurse is teaching about the iron content in breast milk. What is the typical amount of iron found in 100 ml… - RRB Nsg. Superintendent-2026 (Shift -1st)

RRB Nsg. Superintendent-2026 (Shift -1st)

Applied Nutrition & Dietetics

Easy

Appeared in: RRB Nsg. Superintendent-2026 (Shift -1st)

Explanation

Mature breast milk contains a trace amount of iron, specifically 30–50 micrograms per 100 ml, which converts to 0.03–0.05 mg/100 ml.
This range falls squarely within the correct option of 0.03 to 0.07 mg/100 ml.
Despite the low concentration, the iron in breast milk is highly bioavailable (about 50% is absorbed), making it sufficient for a full-term infant's needs for the first 4-6 months.
Full-term infants are born with iron stores accumulated during the third trimester of pregnancy, which supplements their dietary intake from breast milk.

Option B: This value is excessively high and does not reflect the natural trace amounts of iron in human breast milk. Such a high concentration would be toxic to an infant.
Option C: This value is also significantly higher than the physiological iron content of mature breast milk and would be considered a toxic level.
Option D: This range is characteristic of iron-fortified infant formula, not natural breast milk. Formula requires a much higher iron content to compensate for its very low bioavailability (poor absorption).

Visual 1: Comparative Table - A table showing the differences in iron concentration and bioavailability between human breast milk, cow's milk, and iron-fortified infant formula. This visually reinforces why formula needs more iron and why the low amount in breast milk is sufficient.

Clinical Relevance

Nursing practice connection: Knowing Nutritional Composition of Breast Milk: Iron Content helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses must educate parents that for healthy, full-term, exclusively breastfed infants, iron supplementation is not needed for the first 4-6 months.
It is a critical nursing responsibility to advise parents to introduce iron-rich complementary foods (e.g., iron-fortified cereals, pureed meats) at around 6 months of age to prevent iron-deficiency anemia as the infant's prenatal stores deplete.
What if? If the infant was born prematurely, their iron stores would be significantly lower. In this case, the answer changes. Premature infants require early iron supplementation, often starting at 2-4 weeks of age, as breast milk alone will not be sufficient to meet their needs.

How to Approach the Question

First, identify the question type. This is a factual recall question asking for a specific nutritional value.
Access your knowledge about the composition of breast milk. Recall the key principle that breast milk, while being the ideal food, is naturally low in iron.
Scan the given options. Look for the value that represents a 'trace' or very small amount. The range '0.03 to 0.07 mg' is orders of magnitude smaller than the other options.
Eliminate the higher values. The range of 0.8-1.8 mg is a common value for fortified formula, and the other two options are unphysiologically high.
Select the lowest range as it aligns with the known low iron content of mature human milk.

Concept Tested & Keywords

Concept Tested: Nutritional Composition of Breast Milk: Iron Content
Stem keywords: iron content, breast milk, mature breast milk, 100 ml
Lead-in keywords: What is, typical amount
Clinical cues: The term 'mature breast milk' is a cue that refers to the milk produced after the initial colostrum and transitional milk phases, which has a stable nutritional composition.

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