A comprehensive newborn exam: part II. Skin, trunk, extremities, neurologic.

Skin findings are common during the newborn examination. Although these findings are often benign, it is important to visualize the entire skin surface to distinguish these findings and appropriately reassure parents. The chest should be observed for symmetric movement, pectus excavatum, pectus carinatum, prominent xiphoid, or breast tissue. The infant should be as relaxed as possible so that the physician can more easily detect any abdominal masses, which are often renal in origin. A single umbilical artery may be associated with another congenital abnormality, especially renal anomalies, and intrauterine growth restriction and prematurity. Signs of ambiguous genitalia include clitoromegaly and fused labia in girls, and bilateral undescended testes, a micropenis, or a bifid scrotum in boys. Sacral dimples do not warrant further evaluation if they are less than 0.5 cm in diameter, are located within 2.5 cm of the anal verge, and are not associated with cutaneous markers; dimples that do not fit these criteria require ultrasonography to evaluate for spinal dysraphism. Brachial plexus injuries are most common in newborns who are large for gestational age, and physical therapy may be required to achieve normal function. Patients with abnormal findings on Ortolani and Barlow maneuvers should be evaluated further for hip dysplasia. It is also important to assess newborns for tone and confirm the presence of normal primitive reflexes.