And what that gives the fetus is passive immunity to any type of antigen or pathogen that might infect that fetus. And this is important because as the fetus is developing his or her immune system is also developing. So it's important that during this process of development our fetus has an ability to fight off an infection that infects that mother. Now, another way we pass down or we create passive immunity naturally is via the process of breastfeeding. So the milk that is found in women during the process of breastfeeding contains yet another type of immunoglobulin antibody known as immunoglobulin A. And once our child gains the immunoglobulin A via the milk via the process of breastfeeding, that boosts their immune system because the child's immune system is still developing following childbirth.