Donating blood while breastfeeding is possible and generally considered safe by many health organizations, including the American Red Cross (as long as you’re six weeks postpartum or more).
However, it's crucial to maintain adequate hydration and nutrition if you're planning to donate blood during this time. Blood donation, as well as breastfeeding, can increase your body's demand for fluids and nutrients, so it's important to address these needs accordingly.
Post-donation, it's recommended to rest and recover properly to replenish your blood cells without disturbing your breastfeeding routine. If there's any uncertainty or you're experiencing health issues, it's advised to consult your healthcare provider before making a decision to donate blood.