Pediatrics Nutrition 94d3ba3e The average whey/casein ratio in breast milk is: A 60:40:00 B 80:20:00 C 0.888888889 D 40:60 High-Yield Explanation a. 60:40(Ref: Nelson's 20/e p 286-290, Ghai 8/e p 150-161)Human milk contains two types of proteins 60% is: whey and 40% is casein; helps in quick & easy digestion.