The phrase "one's supply of breast milk" refers to the amount of milk produced by a mother's breasts that can be given to her baby for nourishment. Full definition
However, even if you can only breastfeed from one side, it's still possible to make a healthy supply of breast milk for your child. (verywellfamily.com)
Almost all women can create a healthy supply of breast milk for their baby. (verywellfamily.com)
Except I had a larger supply of breast milk in my freezer when I returned to work. (fitpregnancy.com)