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  • Can Breasts Be Different Sizes? for Kids


    As breasts grow, they change shape and size. So sometimes one breast may be bigger than the other.

  • Male Reproductive System for Teens


    What makes up a guy's reproductive system and how does it develop? Find the answers to these questions and more.

  • Male Reproductive System for Parents


    The male reproductive system is made up of the parts inside and outside a male’s body that help make a baby. Learn about them and how they work.

  • Breasts and Bras for Kids


    Girls grow breasts as they develop and mature. And once a girl has breasts, she probably will want to wear a bra. Find out more in this article just for kids.

  • Female Reproductive System for Parents


    The female reproductive system is made up of the parts inside and outside a female’s body that help make a baby. Learn about them and how they work.

  • Female Reproductive System for Teens


    Why do girls get periods? What goes on when a woman gets pregnant? What can go wrong with the female reproductive system? Find the answers to these questions and more in this article for teens.

  • Atrial Septal Defect (ASD) for Parents


    Atrial septal defect (ASD) — also known as a "hole in the heart" — is a type of congenital heart defect. Most ASDs are diagnosed and treated successfully.

  • Female Reproductive System (Slideshow) for Teens


    This slideshow explains how the female reproductive system works.

  • Kidneys and Urinary Tract for Parents


    The bean-shaped kidneys, each about the size of a child's fist, are essential to our health. Their most important role is to filter blood and produce urine.

  • Eyes for Teens


    Although your eyes are small, their structure is incredibly complex. Find out how they work in this body basics article.