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Learn the differences in the skeletons of children and adults.

JA means that the lining of 1 or more of your child's joints is inflamed. This causes pain and swelling. JA is long-term (chronic) condition.

Learn how the skeleton bones develop from infants to teens.

An atrial septal defect is a hole in the dividing wall (atrial septum) between the heart's 2 upper chambers (atria). It may close on its own as your child grows. In some cases, surgical repair is needed.

ASD repair can be done with either cardiac catheterization or with open heart surgery. Your child's cardiologist or surgeon will discuss the best treatment for your child with you.

An arrhythmia can cause your child's heart to pump blood less efficiently. Many arrhythmias are harmless and don't need to be treated. But if it causes symptoms, it may need treatment.

Catheter ablation is a way to treat a tachycardia. This is an abnormal heart rhythm (arrhythmia) in which the heart beats too fast.

The heart makes sounds as the heart valves open and close to allow blood to flow through the heart. When blood does not flow smoothly through the heart or heart valves, it causes the noise. This is called turbulence. Heart murmurs can be harmless (innocent) or caused by a heart problem (pathologic).

Learn how the heart works.