Which sign may indicate a respiratory issue in a newborn immediately after birth?

Cyanosis is a critical sign that may indicate a respiratory issue in a newborn immediately after birth. This bluish discoloration of the skin, particularly noticeable around the lips and extremities, suggests that the baby is not receiving enough oxygen. In a newborn, the initiation of effective breathing after birth is vital for oxygenation, and any cyanotic appearance can raise immediate concern for potential respiratory distress or inadequate pulmonary function.

Normal heart rate, good muscle tone, and stable blood sugar levels, while important indicators of overall health, do not specifically point to respiratory issues. A normal heart rate indicates good cardiovascular function, and good muscle tone implies a degree of maturity and neurological well-being. Stable blood sugar levels, although important for metabolic health, do not provide information about a newborn's respiratory status. Therefore, when evaluating a newborn immediately after birth for potential respiratory complications, the presence of cyanosis serves as a key warning sign that requires prompt assessment and intervention.