breast milk

This term is primarily used in medical, nutritional, and parenting contexts. It carries a strong connotation of natural health and optimal nutrition for infants, often contrasted with "formula" in discussions about infant feeding practices.

As a mass noun, it refers to the substance in general. When referring to specific quantities, speakers use partitive constructions such as "an ounce of breast milk" or "a bottle of breast milk" rather than pluralizing the term.