Because of its highly guarded process it is unknown if actual breast milk is used. (en.wikipedia.org)
But with breast augmentation being the most popular form of plastic surgery in the US and rappers continuously singing about colossal a $ $ es, these researchers were interested in determining which female hump is viewed as most attractive by men, gathering ratings of actual breasts and butts to determine characteristics of attractiveness, and confirming booty / breast preferences with eye movements. (scienceofrelationships.com)
Worked full time so pumped more and more and actual breast feeding less. (babywisemom.com)