Blood volume and blood circulation increases during pregnancy and these changes are like a one-two punch on capillaries under the skin. The result of this can be spider veins: veins that can resemble spider webs running under the skin, hence the name.

For some women, spider veins are hereditary and can not be prevented during pregnancy. Other women find they see spider veins after crossing their legs for long periods of time. 

Vitamin C deficiency may also be linked to spider veins, so increasing daily vitamin C with natural foods like Oranges and other vitamin C rich fruits is a good option.

If spider veins stick around after pregnancy, laser treatments can be used to fade away the veins and return the skin to pre-pregnancy beauty. Laser treatments, however, are only considered to be safe after giving birth. Even with laser treatments it can take up to approximately a year for spider veins to begin to fade.