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The most common form of birth defects are congenital heart defects. This article describes the causes, symptoms, and treatments of congenital heart defects. Cleft Lip and Cleft Palate. The 4th most common birth defect is a cleft lip or palate.
Miscarriages are the most prevalent form of pregnancy loss, occurring with 10-25% of all pregnancies. Of these, 50-75% of miscarriages will be chemical pregnancies. A chemical pregnancy is one in which the miscarriage occurs not too longer after implantation.