Jejunal atresia is a rare congenital malformation. Mortality, which was 90% in the 1950s, decreased to approximately 10%. There are studies reporting 1/5000 incidence. We presented a case with polyhydramnios and enlargement of the intestines in the prenatal period, a nutritional defect after birth, with dilated bowel loops with air-fluid levels on the direct abdominal x-ray, and operated on the first day of postnatal diagnosis. Keywords: Abdominal distention, Polyhydroamniosis, Jejunal atresia, Newborn.