Among the following, which component is not present in human milk?

AIIMS Delhi NO-2016

Applied Nutrition & Dietetics

Medium

Appeared in: AIIMS Delhi NO-2016

Explanation

Human milk is considered a poor source of Vitamin D, containing levels (typically less than 100 IU/L) that are insufficient to meet an infant's daily requirement of 400 IU.
This insufficiency places exclusively breastfed infants at a high risk for Vitamin D deficiency and related conditions like rickets (a softening and weakening of bones).
Due to this natural deficiency, the American Academy of Pediatrics (AAP) and other global health organizations recommend a daily 400 IU Vitamin D supplement for all breastfed infants.
While technically present, its clinically insignificant amount makes it the correct answer for a question asking what is 'not present' in a functional sense.

Option A: Calcium is present in human milk. Although the concentration is lower than in cow's milk, it is highly bioavailable, meaning the infant's body can absorb and use it very efficiently.
Option C: IgA, specifically secretory IgA (sIgA), is a major component of human milk, especially in colostrum. It is a critical antibody that provides passive immunity to the infant, protecting their gastrointestinal and respiratory tracts from pathogens.
Option D: Folate (a B vitamin) is present in human milk at levels adequate for the infant's growth and development. The mother's body effectively transfers folate into her milk.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Nutritional composition of human breast milk and identification of deficient components as background academic context rather than a clinical decision trigger.
A key nursing responsibility is educating new mothers about the need for Vitamin D supplementation for their breastfed infants to prevent rickets. This counseling is a standard part of postpartum and pediatric care.
Nurses should assess for risk factors for severe Vitamin D deficiency, such as maternal deficiency, darker skin pigmentation in mother and infant, and limited sun exposure.
What if the infant is formula-fed? In that case, Vitamin D supplementation is generally not needed. Standard infant formulas are required by law to be fortified with adequate amounts of Vitamin D (at least 400 IU/L) to meet the baby's needs.

How to Approach the Question

First, analyze the question's core demand: identify a component 'not present' in human milk.
Consider the options: Calcium, Vitamin D, IgA, and Folate. Access your knowledge of breast milk composition.
Recognize that 'not present' in a clinical context can sometimes mean 'present in clinically insignificant or deficient amounts' rather than being absolutely absent.
Evaluate each component. Calcium, IgA, and Folate are known to be present in significant, functional amounts.
Recall or deduce that Vitamin D is famously deficient in breast milk and requires supplementation. This makes it the most likely correct answer.
Select Vitamin D, understanding that the question tests a critical point of clinical knowledge regarding infant nutrition and supplementation.

Concept Tested & Keywords

Concept Tested: Nutritional composition of human breast milk and identification of deficient components.
Stem keywords: human milk, component, not present
Lead-in keywords: not present
Negative lead-in flag: The question uses negative framing ('not present'), which can be misleading. In this context, it refers to the component that is clinically deficient rather than completely absent.

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