Caffeine
From the Breastfeeding Answer Book page 130
According to research, very little caffeine passes into a mother's milk, between 0.6 to 1.5 percent of the maternal dose (Berlin 1984). One study found that it takes the amount of caffeine that is in more than five cups of coffee per day before a breastfeeding baby is affected (Nehlig and Debry 1994). Caffeine can accumulate in a newborn's system, but this becomes less of an issue as the baby grows. According to one estimate, the half-life of caffeine is about five hours in an adult, 96 hours in a newborn, and 14 hours in a three- to five-month-old baby (Hale, p. 100).
When figuring caffeine intake, be sure the mother is counting all her sources, including coffee, iced and hot teas, colas, other soft drinks containing caffeine, and any over-the counter drugs that contain caffeine. Also, caffeine is found in most cola soft drinks, but it is also in other soft drinks, so encourage her to check the label. Some over-the-counter drugs also contain caffeine.
Be sure to mention that chocolate contains a substance called theobromine, which is similar to caffeine and can produce the same effect if consumed in large amounts.
If a breastfeeding mother consumes more caffeine in a day than is in five 5-oz cups of coffee (750 ml), caffeine could begin accumulating in her baby's system, causing symptoms of caffeine stimulation.
A baby who is being over stimulated by caffeine is a wide-eyed, active, alert baby who doesn't sleep for long. He may also be unusually fussy. To find out if these symptoms are caused by caffeine, suggest the mother try going without caffeine for a week or two and substituting caffeine free beverages, both hot and cold, for her caffeinated drinks. (If a mother has been consuming large amounts of caffeine, she may experience headaches when she eliminates it from her diet.)
Best wisehs,
SARAH