Aortic stenosis means that your child has a heart valve that is too narrow or is blocked.  The aortic valve is 1 of 4 heart valves that keep blood flowing through the heart. The valves make sure blood flows in only one direction. The aortic valve keeps blood flowing from the left ventricle to the aorta.

Warts on the skin are harmless growths. They are caused by a virus. Warts can spread to other parts of the body and to other people.

Poison ivy rash is an allergic reaction to poison ivy. Learn how to care for your child if they are around poison ivy.

Impetigo is a skin infection. When it affects just the surface, it’s called superficial impetigo. Impetigo can also affect deeper parts of the skin. This is called ecthyma. It may occur on healthy skin. Or it may occur where the skin was injured by a cut, scrape, or insect bite.

Fifth disease is a viral illness that causes a rash. It occurs most often in the winter and spring.

Diaper dermatitis is inflammation of the skin in the diaper area. It’s a very common condition in babies and toddlers.

Cradle cap (infant seborrheic dermatitis) is scaly patches on a baby's scalp. Cradle cap isn’t serious, but it can cause thick crusting and white or yellow scales. Some babies can also have seborrheic dermatitis in the diaper area, and on the face, neck, and trunk. Cradle cap usually clears up within the first year.

Detailed information on blisters, including causes, first aid, and treatment.

Detailed information on birthmarks and the different types, including vascular birthmarks, hemangiomas, and port-wine stains.

Thumb-sucking is normal in infants and young children. It shouldn't cause any permanent problems if your child stops by age 5.