Ebstein anomaly is a rare birth defect where the right-side heart valve sits too low and leaks. Because blood flow is sluggish, symptoms can be mild for years or loud from day one.

Blueness is the first clue. Lips or fingernails may look faintly blue during feeding, crying, or even at rest.

Fast breathing pops up early. Babies breathe more quickly than normal, especially when they eat or sleep.

Heart racing or skipped beats are common. You feel sudden flutters, thuds, or notice the pulse is faster than normal.

Poor weight gain follows. Kids tire at the bottle or playground and don’t keep up with friends.

Swelling appears late. Ankles, feet, or belly can puff if the right heart fails.

Sudden fainting or chest pain may occur if the heart short-circuits—an alarm that the valve leak is severe.