Question

Newborns ______.

Options

• receive IgM antibodies from the mother through placental transfer

• have virtually a full complement of maternal IgG antibodies

• have very few lymphocytes in their circulation

• receive maternal B-cells

Answer 1

Newborns have virtually a full complement of maternal IgG antibodies.

Explanation:

Newborns do not receive IgM antibodies from the mother through the placenta; IgM antibodies do not cross the placenta. Instead, they primarily receive maternal IgG antibodies, which provide passive immunity. Newborns generally have an immature immune system but have a substantial number of lymphocytes circulating. Maternal B-cells are not transferred to the newborn.