Infants are born with a passive immunity that occurs when immunoglobulin antibodies cross the placenta from the maternal circulation prior to birth. Which immunoglobulin is capable of crossing the placenta?

Immunoglobulin G (IgG)

Explanation:

There are five classes of human antibodies:

IgG is the most abundant and the only one capable of crossing the placenta. IgG is present in all body fluids and protects against infections.

answer; i believe that the correct answer is (lung);