What is the most common fetal complication associated with parvovirus infection during pregnancy?

Parvovirus B19 infection during pregnancy can lead to a variety of fetal complications, with the most notable being severe anemia due to the virus's effect on erythropoiesis. This can subsequently lead to hydrops fetalis, which is a serious condition characterized by an abnormal accumulation of fluid in fetal compartments. While myocarditis can occur, it is not the most common complication associated with parvovirus infection.

The primary fetal complication is actually growth restriction, as the virus often results in hemolytic anemia that can impede normal fetal growth and development. This growth restriction is directly linked to the impact of anemia on the fetal condition, leading to a range of potential complications that are more prevalent than other conditions like congenital heart defects or neurological disorders.

Overall, the most significant risk from parvovirus B19 infection during pregnancy is growth restriction due to its association with fetal anemia and hydrops rather than the less common complications of myocarditis or other cardiovascular issues.