International Board of Certified Lactation Consultant (IBCLC) Practice Exam

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What is the whey to casein ratio in cow milk-based infant formula?

10:90
20:80
30:70
40:60

The correct answer is: 20:80

In cow milk-based infant formulas, the typical whey to casein ratio is approximately 20:80. This ratio is important because it reflects the balance of proteins that are present in human milk, although human milk has a higher whey content compared to casein. The whey proteins are more easily digestible and provide crucial immune protection, while casein is important for the formation of curds in the stomach, aiding in nutrient absorption. By replicating this ratio, formulas aim to mimic the nutritional profile of human breast milk as closely as possible while still meeting an infant's developmental needs. Choosing a formula with a 20:80 ratio allows infants to benefit from the easier digestion of whey protein while still getting the necessary calories from casein. This balance is critical for supporting healthy growth and development during the early months of life.