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Hemolytic disease of the newborn occurs when the blood types of a mother and baby are incompatible.

Hemolytic uremic syndrome (HUS) is a rare condition that can lead to kidney failure in children.

Secondary headaches are caused by another medical condition. Primary headaches are most often migraine and tension-type headaches.

Heart failure in children occurs when a child’s heart is not working as well as it should.

Hyperthyroidism is a thyroid disorder that increases metabolism and can affect many cells throughout the body.

Hypocalcemia is a condition in which there is too little calcium in a baby's blood.

Hyperparathyroidism is a condition where the parathyroid glands make too much parathyroid hormone.

Hypertension (high blood pressure) refers to how hard the blood is pushing against the walls of the artery through which it flows — not how quickly it flows.

Hypoglycemia is the state of having a blood glucose level that is too low to effectively fuel the body's cells.