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Related Experiment Videos

Changes in specific nutrients in breast milk during extended lactation.

M V Karra, S A Udipi, A Kirksey

    The American Journal of Clinical Nutrition
    |April 1, 1986
    PubMed
    Summary

    Extended breast-feeding beyond six months may alter milk nutrient levels. Zinc, calcium, vitamin B6, and vitamin C concentrations tend to decrease, while folacin remains stable. Magnesium decreases after 18 months.

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    Area of Science:

    • Human nutrition
    • Lactation physiology
    • Infant health

    Background:

    • Increasing trend of extended breast-feeding beyond six months observed.
    • Need to understand the impact of prolonged lactation on human milk composition.

    Purpose of the Study:

    • To examine the effect of extended lactation on key nutrient concentrations in human milk.
    • Investigate changes in vitamins B6 and C, folacin, calcium, zinc, and magnesium.

    Main Methods:

    • Studied forty mothers from 7 months postpartum until cessation of breast-feeding.
    • Collected monthly milk samples during morning feedings.
    • Analyzed concentrations of specific vitamins and minerals.

    Main Results:

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  • Zinc, calcium, vitamin B6, and vitamin C levels showed a decreasing trend between 7 and 25 months of lactation.
  • Free and total folacin concentrations remained unchanged during the study period.
  • Magnesium levels decreased significantly only after 18 months of lactation.

    • Conclusions:

    • Extended lactation is associated with changes in human milk composition.
    • Decreases in zinc and calcium correlated with reduced feeding frequency.
    • These alterations may indicate physiological adaptations in the mammary gland during the weaning process.