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

It’s because the child is determined by information in your dna. Vaccinations normally do not alter your dna; they provoke a response from your immune system in an attempt to simulate what would happen if you actually contracted an illness and had resulting immunity.