In this issue of Clinics in Perinatology, guest editors Drs. Patrick Gallagher and Alex R. Kemperbring their considerable expertise to the topic of Genetics, Newborn Screening, and Inborn Errors of Metabolism. Early recognition through newborn screening is vital for detecting the 6,000 potentially affected newborns each year in the U.S., as timely treatment can prevent early death and long-term morbidity. In this issue, top experts provides important clinical updates in genetic testing, genome sequencing, and newborn screening.