This document discusses various types of congenital deformities present at birth including genetic deformities passed down from parents' genes and non-hereditary deformities caused by damage during fetal development. Specific deformities mentioned include Down syndrome, spina bifida, hydrocephalus, anencephaly, and esophageal atresia. The document also examines different ethical perspectives on whether doctors and nurses should condone letting malformed infants die or be killed mercifully, including views from the Roman Catholic Church, Kantian principles, and philosophers Ross and Fletcher.