In humans, the immune system is relatively undeveloped at birth, and immunocompetence (ability to mount an immune response) develops thereafter, yet newborns have circulating antibodies. Where do these come from? Is the post-natal development of the immune system an advantage or disadvantage? Why or why not?

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The Answer of In humans, the immune system is relatively undeveloped at birth, and immunocompetence (ability to mount an immune response) develops thereafter, yet newborns have circulating antibodies. Where do these come from? Is the post-natal development of the immune system an advantage or disadvantage? Why or why not?

In Humans, the Immune System Is Relatively Undeveloped at Birth