What are the negative health effects of a baby created through incest?

Consanguinity = the : union of two people who share at least 1 common ancestor. Prenatal genetic counsellors calculate the ^ed risk of their fetus' having an autosomal recessive disease from inheriting a deleterious gene from both parents, a weakened immune system &/or early demise from the percentage of shared genes, history of inbreeding in prior generations, & results of prenatal blood & ultrasound findings.