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These figures, the latest available from the CDC, are for white children. Life expectancy for a black boy born in 2006 is 70 years, and for a black girl, 77 years.

This vaccine usually is given to the infant in the hospital. Other vaccines begin between six and eight weeks after birth.

Symptoms emerge as early as age 4 but often go undiagnosed until the middle-school years, when difficulties arise in the classroom.

Calorie needs range from 1,650 to 3,000, depending on the age, gender, and activity level of the child. Aim for a diet that's low in fat and high in complex carbohydrates and fiber.

The National Alliance for Sports estimates that 70 percent of children participating in recreational sports quit by 13 and never play again.

A 12-year-old needs 9 hours. In contrast, a 6-year-old needs almost 11 hours.

Iron is needed to support the expanding blood volume and muscle mass of adolescent bodies. Girls, in particular, are at risk for low levels because of menstruation.

Unintentional injuries account for nearly 50 percent of teen deaths. Teenagers are at greater risk of because of gang activity, motor-vehicle accidents, substance abuse, and access to firearms. Homicide and suicide are the second and third leading causes, accounting for 14.1 and 12.4 percent of all teen deaths.