<unk>  is a congenital disease whose symptoms appear within hours to days after birth. Babies with<unk>  usually have no symptoms at the time of birth, but soon after will begin to breathe rapidly, showing increased work of breathing, and may have blue discoloration around the lips, arms, or legs, especially when feeding or crying. If an echocardiogram is performed, marked thickening of the right ventricle will be seen, resulting from highly elevated pulmonary blood pressure.<unk>  is generally resistant to treatment. Babies who have persistent symptoms that are poorly relieved by standard therapies for neonatal pulmonary hypertension is commonly observed in<unk> . Atypical forms of<unk>  have been reported with only mildly rapid breathing shortly after birth. They may present with the above symptoms of<unk>  at several months of age. Their symptoms may improve with standard pulmonary hypertension therapies for weeks to months before symptoms return. Babies born with<unk>  usually have other congenital abnormalities affecting the heart, the intestines, urinary system, or genitals.
Alveolar capillary dysplasia
Persistent fetal circulation
Pulmonary alveolar proteinosis
Sepsis
Congenital pulmonary airway malformation
Pneumonia
Pulmonary alveolar microlithiasis
Infant respiratory distress syndrome