Is it serious if an infant's ribs are flared out?

Patient's question:

I'm not sure if it's because the clothes the baby usually wears are a bit tight, and I've noticed that the baby's ribs are slightly protruding. Of course, it's not very serious, and I'm very worried. I want to know if it's serious for the baby's ribs to protrude?

Doctor's answer:

Flaring ribs refer to the phenomenon where the lowest ribs extend beyond the body's outer edge. Flaring ribs occur because the two lower ribs at the bottom of the sternum are not connected to the calcaneus and sternum. During inhalation and exhalation, the movement of the child's abdomen is greater. Flaring ribs happen when the ribs flare. There are two reasons for flaring ribs in infants and young children: one is the normal physiological development process of infants and young children, and the other is a simple developmental anomaly of the ribs, which generally has no significant impact.

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