This is especially true for preterm infants born at extremely low GAs (<28 weeks), leading to high risk for poor general growth, poor brain growth, and neonatal morbidities such as intraventricular hemorrhage, retinopathy of prematurity (ROP), bronchopulmonary dysplasia (BPD), and necrotizing enterocolitis (NEC).43 In very preterm infants, the regulation of thyroid hormones is still immature. The gene discussed is TG; the disease is necrotizing enterocolitis.