Yes, it is generally safe to drink coffee while breastfeeding, but it is recommended to limit caffeine intake to about 200 to 300 milligrams per day, which is roughly equivalent to two to three 8-ounce cups of brewed coffee. Small amounts of caffeine do pass into breast milk, but most babies tolerate it well without any adverse effects. However, younger babies, especially those under 6 months or premature, metabolize caffeine more slowly and may be more sensitive. Signs that caffeine might be affecting a baby include increased fussiness, irritability, trouble sleeping, and restlessness. To minimize any possible effects, it is suggested to consume caffeine before or right after breastfeeding to allow time for the caffeine to metabolize before the next feeding. Mothers should also watch for any signs of baby sensitivity and adjust caffeine intake accordingly. Overall, moderate coffee consumption is safe during breastfeeding, but moderation and attention to baby's reactions are important.