The following signs and symptoms may indicate that a baby has persistent pulmonary hypertension of the newborn (PPHN):

• Rapid breathing, also called tachypnea;
• Rapid heart rate;
• Respiratory distress, including signs such as flaring nostrils and grunting;
• Cyanosis, a condition in which the baby's skin has a bluish tint, even while they are receiving extra oxygen to breathe;
• Heart murmur, where a baby has an extra or abnormal heart sound;
• Low oxygen levels -- a baby with PPHN may continue to have low oxygen levels in their blood, even while receiving 100 percent oxygen.

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