Blood Donation While Breastfeeding. Following childbirth, the deferral period is at least 9 months (as for pregnancy) and until 3 months after your baby is significantly weaned (i.e. In order to donate blood, a woman must have a hemoglobin level of at least 12.5 g/dl, and a man must have a hemoglobin level of at least 13.0 g/dl.

They recommend waiting 9 months after the pregnancy ends or 3 months after the baby is mostly weaned. Donating blood while breastfeeding is not advised. I know the american red cross let’s you donate after 6 weeks postpartum but other countries have you wait longer.