Moderate consumption of black coffee is generally considered safe while breastfeeding. The American Academy of Pediatrics (AAP) and the World Health Organization (WHO) both state that moderate caffeine consumption is unlikely to have adverse effects on a breastfeeding infant. However, excessive caffeine intake can lead to irritability, sleep disturbances, and other symptoms in both the mother and the infant.
It's generally recommended that breastfeeding mothers limit their caffeine intake to no more than 300 milligrams per day, which is equivalent to about 2-3 cups of coffee. It's important to note that the caffeine content can vary widely between different types of coffee, and other foods and beverages like tea, chocolate, and some sodas also contain caffeine, so it's important to take these into account when calculating your overall caffeine intake.
If you're concerned about the effect of caffeine on your breastfed infant, you may want to monitor your baby's behavior and sleep patterns after you consume caffeine to see if there are any adverse effects. If you notice any negative effects, you may want to consider reducing or eliminating caffeine from your diet. It's always a good idea to consult with your healthcare provider if you have any concerns.