International Board of Certified Lactation Consultant (IBCLC) Practice Exam

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What percentage of breastmilk is composed of protein?

Approximately 0.5 to 0.7 %
Approximately 0.8 to 1 %
Approximately 1.5 to 2 %
Approximately 2 to 3 %

The correct answer is: Approximately 0.8 to 1 %

The composition of breast milk is a well-studied area, and the percentage of protein in breast milk typically falls within the range of approximately 0.8 to 1%. This percentage reflects the unique nutritional needs of infants, providing sufficient protein for growth and development without overwhelming their immature kidneys. Breast milk contains a variety of proteins, including whey and casein, which play crucial roles in immune function and overall health. The proteins in breast milk are designed to be easily digestible for infants, supporting their developmental needs during the early stages of life. Understanding the specific percentage of protein in breast milk is essential for lactation consultants and healthcare providers because it informs recommendations for breastfeeding and managing feeding practices for infants. The correct answer highlights the balance breast milk strikes to promote healthy growth while ensuring that infants receive optimal nutrition.