MedGen

Recurrent episodes of apnea occurring in infants born less than 37 weeks of gestation, defined specifically as a pause of breathing for more than 15-20 s, or accompanied by oxygen desaturation (SpO2 not more than 80% for at least 4 s) and bradycardia (heart rate less than 2/3 of baseline for at least 4 s), in infants born less than 37 weeks of gestation. [from HPO]

A blood disorder characterized by low hemoglobin levels in premature neonates that usually spontaneously resolves within 3-6 months post birth. A combination of factors including the transition from the liver to the bone marrow for erythropoiesis in a neonate, blood loss experienced during delivery, the shortened life span of fetal blood cells, and an acclimation to a relatively hyperoxic environment outside the womb can predispose a neonate to this condition. [from NCI]