IgG is the immunoglobulin class, found in blood, lymph, and the intestine, which cross the placenta and help to protect a fetus.
The only kind of immunoglobulin that can cross the placenta is IgG, which gives the growing fetus some degree of immunological defense. During pregnancy, specific antibodies are transferred from the mother's blood into the fetus' circulation in the form of IgG, resulting in naturally acquired passive immunity.
Natural interactions between mother and child throughout pregnancy and afterward are examples of how antibodies are passed from one person to another. The body's primary defense against microorganisms is a key class of immunoglobulins. In order to shield neonates from infections, only this family of antibiotics might cross the placenta.
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