Can a lactating woman donate blood?

Assuming you're not at risk for anemia or other medical problems that would prohibit you from donating, the American Red Cross will allow you to donate blood if it's been at least six weeks since you delivered your baby. You do lose hydration when you donate, and since your milk supply is dependent on your being well hydrated, you should drink water before and after donating blood. Having a 200- to 300-calorie snack before or after can also help you feel better after you donate.