> If I understand correctly, they then also showed that vaccination pre-pregnancy has inheritable benefit to their offspring in reducing the severity of illness

> If I understand correctly, they then also showed that vaccination pre-pregnancy has inheritable benefit to their offspring in reducing the severity of illness in their children. Mothers pass on all the antibodies they have in their blood and breast milk to the baby. This effect diminishes greatly after colostrum is gone and stops as soon as the baby is weaned. This can be considered an external immune system. Once the baby is weaned, it is fully vulnerable to all the diseases it might have been protected from by its mothers antibodies.