Moderate caffeine consumption (around 300 to 500 mg per day, or about three to four cups of coffee) is generally considered safe for most breastfeeding moms. This means you can still get your morning coffee boost without worrying too much.

Now, the fun fact is that newborns and preterm infants break down caffeine slowly, so moms nursing these little ones might want to consider a lower intake. Also, if you're someone who enjoys more than just a few cups of coffee a day, you might want to be a bit cautious. Babies of moms consuming caffeine equivalent to 10 cups of coffee or more have been reported ¹ to be fussy and have poor sleep patterns. 

And one last thing to watch out for: studies have suggested that consuming more than about 450 mL of coffee a day might decrease iron levels in breastmilk, potentially leading to mild iron deficiency anemia in some breastfed babies. 

So while you don't have to give up that morning cup of joe, it's a good idea to keep tabs on how much caffeine you're consuming overall.