Probably well studied in pregnant moms with cancer or transplants. I would guess not a big impact as far as we know today. First there are cases where the maternal immune system attacks the fetus. Second the placenta generates immunosuppressants to prevent that, third, the fetus itself and the baby at birth does not have any innate immunity. In fact the baby relies on the moms immunity after birth.
Probably well studied in pregnant moms with cancer or transplants. I would guess not a big impact as far as we know today. First there are cases where the maternal immune system attacks the fetus. Second the placenta generates immunosuppressants to prevent that, third, the fetus itself and the baby at birth does not have any innate immunity. In fact the baby relies on the moms immunity after birth.