Skin Pigmentation

• Pregnant women are at a greater risk for developing melasma, which is discoloration of the skin, when exposed to UV rays. While this is not dangerous, it is unsightly.
  
  

Folic Acid

• UV rays can decrease the amount of folic acid in the bloodstream, which is a necessary element for a baby's nervous system development.
  
  

Temperature

• Increased body temperatures that may occur while in a tanning bed may be dangerous for a developing baby.
  
  

Pressure

• Lying on your back while pregnant can put pressure on blood vessels and restrict blood flow.
  
  

Dehydration

• Sweating a lot, as can happen in a tanning bed, may lead to dehydration which can be particularly dangerous during pregnancy.