Multiple Sclerosis often affects those of childbearing age. We know that in the first three to six months after delivery there is an increased risk of MS attacks. The overall rate of attacks during the pregnancy and post-partum period does not differ from the attack rate before and after the pregnancy year. It is also keen to know how they can diminish the risk of any children developing MS. We don't know yet which changes during pregnancy cause this reduction, but there are many factors that are altered in pregnancy. There are elevated hormonal levels during pregnancy. One of these hormones, estriol, has been shown to reduce MRI activity in women with MS.