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. This evidence concerns the gene TG and bronchopulmonary dysplasia.