Does caffeine decrease milk supply?
There is no evidence that caffeine decreases milk supply. The myth that caffeine will decrease milk supply is widespread. Many moms consume caffeine, and it ought to be easy to document any adverse effects of caffeine on milk supply. No such effect has been observed, however, despite a number of studies of caffeine intake in breastfeeding mothers and years of clinical observations. In fact, one study (Nehlig & Debry, 1994) indicates that caffeine can stimulate milk production. A baby who is fussy and jittery from caffeine stimulation may not nurse well, however, which could lead to a decreased milk supply over time (due to decreased nursing, rather than the mother’s caffeine intake).