Is caffeine safe while breastfeeding?

What does the evidence say about caffeine while breastfeeding?

1. A daily ceiling of 300 to 500 mg is described as a likely safe level for most nursing parents, while European authorities set the bar lower at 200 mg. 1
2. Moderate caffeine, around 200 mg a day, most likely will not affect your baby, though caffeine content varies widely between coffee brands. 2
3. Newborn and preterm babies metabolize caffeine very slowly and can carry blood levels close to their parent's, which is why a lower intake is preferable in the first weeks. 1
4. Fussiness, jitteriness, and poor sleep patterns have been reported in babies whose nursing parents took in the equivalent of about ten or more cups of coffee daily. 1
5. Caffeine passes into breast milk in small amounts, and agitation, irritability, trouble sleeping, a fast heart rate, or tremor are the signs worth reporting to your baby's provider. 3

How caffeine changes by nursing stage

• Early weeks. This is the stretch where a lower ceiling makes the most sense. A newborn breaks caffeine down far more slowly than you do, so daily intake can build up in a way it never does later.
• Established nursing. By the time feeds settle into a rhythm and your baby is a few months old, the usual 200 to 300 mg range is where most guidance sits. Watch your own baby rather than the number.
• Weaning. As nursing sessions taper, less of what you drink reaches your baby at all. Your own sleep is usually the better reason to watch late-afternoon coffee at this stage.