Why does the 1^{st} child of an Rh^+ husband | vedclass

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Question

(D) The correct answer is $(d)$.Erythroblastosis foetalis does not occur in the first child because the mother's blood initially lacks $Rh$ antibodies

Vedclass · Accepted Answer

Both $(a)$ and $(c)$

Vedclass · Answer

(D) The correct answer is $(d)$.Erythroblastosis foetalis does not occur in the first child because the mother's blood initially lacks $Rh$ antibodies.During the delivery of the first child,there is a possibility of exposure of the maternal blood to a small amount of $Rh^+$ blood from the foetus.In such cases,the mother starts preparing $Rh$ antibodies against the $Rh$ antigen in her blood.Since these antibodies are not present before or during the first pregnancy,the first child remains unaffected.In subsequent pregnancies,the $Rh$ antibodies from the mother can leak into the blood of the foetus and destroy the foetal $RBCs$,leading to erythroblastosis foetalis.

Why does the $1^{st}$ child of an $Rh^+$ husband and an $Rh^-$ wife not have erythroblastosis foetalis?

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