Eli5: How come immunization shots that a woman gets earlier in her life don’t carry on/pass that immunity to her children when she gives birth?

Question

E.g. if a woman has a tetanus shot, why does the kid need one? If she has an mmr shot, why does her child need to get one? If the lady also has a shot immunizing herself from chicken-pox, why isn’t the child also immune from chicken-pox?

Wouldn’t the child be immune from the diseases/ sicknesses that the mother already got her shots for?

In: 108

Answer 1

Because the Memory T cells don’t transfer from the Mother to Child. Immunity comes from the body taking bits of slain viruses and using them as an example for new anti-bodies. These antigens are kept on Memory T Cells. However, these T cells don’t leave the body so the baby only benefits from the mother’s antibodies.