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The normal length of pregnancy is 37 to 41 weeks. Postmaturity is a word used to describe babies born after 42 weeks. Very few babies are born at 42 weeks or later. Other terms often used to describe these late births include post-term, postmaturity, prolonged pregnancy, and postdates pregnancy.

Retinopathy of prematurity is an eye problem that happens to premature babies. The retina lines the back of the eye. It receives light as it comes through the pupil. From there, the optic nerve sends signals to the brain. Retinopathy of prematurity is a problem of the blood vessels of the retina.

Generalized anxiety disorder (GAD) is a mental health problem. A child with GAD has a lot of worry and fear that seems to have no real cause.

Playing tennis or racquetball is a fun way to boost the intensity of your fitness program, as well as improve your balance, strength, and agility.

Primary ovarian insufficiency, or POI, occurs when the ovaries stop working as they should work, before the age of 40. With POI, the ovary does not release an egg each month. Learn about the symptoms and treatment of this condition.

For many people, the extreme tiredness of the first trimester is quite a surprise. And it's an especially hard transition for those who are normally go-getters with lots of energy. Learn more about what causes this fatigue--and what to do to feel better.

A detailed anatomical description of the respiratory system, including simple definitions and labeled, full-color illustrations.

A puncture wound is a deep wound made by a sharp object. This type of wound may become infected easily because dirt and germs are carried deep into the tissues.

Falls are the most common cause of injury visits to the emergency room for young children. Falls cause more open wounds, fractures, and brain injuries than any other cause. Read on to learn about safety steps you can take to prevent a fall for your child.