I think it's equally important to note that cows are not producing milk in a bubble. (ecochildsplay.com)
One example of a chemical and biological response to an environmental trigger is that of a mother's breasts producing milk in response to the sound of the cry of her infant. (motherhoodinpointoffact.com)
So in case for some reason will just randomly stop producing milk which I understand doesn't happen; that I would have something on - hand for my son. (pregnancymagazine.com)