Bones go through a constant state of loss and regrowth. As a person ages, more bone loss than bone growth occurs. This can lead to a condition called osteoporosis. The bones then become thin and fragile and can fracture or break easily.
This pamphlet explains:
Morning Sickness: Nausea and Vomiting of Pregnancy
Barrier Methods of Birth Control - Diaphram, Sponge, Cervical Cap and Condom
How to Prevent Sexually Transmitted Infections
American College of Obstetricians and Gynecologists
PO Box 96920, Washington, DC 20024-6920