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

they sorta do.

they way the placenta works doesnt allow for this sort of mixing ot lead to anythnig permanent regarding immunity(antibodies can pass pass thru but immune cells cannot.) .

however for the 1st 6 or so months or at the least asl ong as the mother is capable of breastfeeding the child will piggyback off the mother’s immune system thru their diet.the idea being that the milk will carry the antibodies but not the actual immune cells kinda like ” you were provided the guns, but not the soldiers, you gotta train those yourself”.