Consensus of studies examining the question of the relationship of water ingetsion to milk production is that they are (basically) unrelated. Some short-term increase may occur, but is not sustained. Drinking to thirst is the best advice in most cases. With my clients, I suggest they use the color of the urine (in the absence of vitamins that might alter this) as a guide: clear or nearly clear urine throughout the day is an indicateor of adequate water intake. It will be more concentrated the first thing in the AM. A caution: iron tabs do make for more "color" and can confuse the issue if mom is on such tablets. Def. of LC service: "We are all faced with a series of great opportunities brilliantly disguised as impossible situations." Kathleen G. Auerbach,PhD, IBCLC (Homewood, IL)- [log in to unmask] WEB PAGE: http://www.mcs.com/~auerbach/lactation.html