Although alcohol passes through your milk, the amount your baby gets is MUCH less than the amount you drink. Studies have shown that alcohol levels in breast milk peak about 30 to 90 minutes after one drink. So while it's probably fine to have one or two glasses of beer or wine a week, wait until the last feeding of the day (just after you nurse rather than just before) to allow a couple of hours per drink for the alcohol to metabolize And that morning cup of java? Your baby may be more irritable and feed more frequently if you ingest A LOT of caffeine. One or two cups of coffee a day won't harm your baby, but try to limit caffeine intake while you're breastfeeding, because babies cant efficiently rid their bodies of caffeine, so it can build up in their systems. Too much caffeine can also cause sleep problems and nervousness. Try drinking decaffeinated coffee and tea, and avoid colas and other carbonated drinks that have added caffeine. And remember, caffeine can be found in chocolate, soft drinks, and some herbal teas and medications, in addition to coffee and tea.