In general, activities in which there is a high risk of falling, such as gymnastics, water skiing, and horseback riding, should be avoided. Some racquet sports also increase the risk of falling because of your changing balance. Other sports to avoid include the following:

• Downhill snow skiing—Your change in balance may put you at greater risk of injuries and falls. Also, you may be at risk of altitude sickness, an illness caused by breathing air that contains less oxygen.
• Contact sports, such as hockey, basketball, and soccer—These sports can result in harm to you and your baby.
• Scuba diving—Scuba diving can put your baby at risk of decompression sickness, a serious illness that results from changes in the pressure surrounding the body.