Prenatal vitamins have been specifically created to suit the needs of pregnant women and their babies. The dosage of the prenatal vitamins has undergone vigorous research and is tailored to the needs of the expectant mother. They are not the same as multivitamins as normal multivitamins have dosages too high for pregnancy.
Vitamin A for example is reduced in prenatal vitamins because too much vitamin A causes problems in a developing baby. They also contain a good but safe supply of folic acid, essential to promote the closing of the spine of the fetus, and hence prevent the development of the neural tube defect known as spina bifida that occurs in the early days of pregnancy.
The other vitamins have also been included in a prenatal vitamin supplement in quantities safe for both the mother and the developing child. Consulting a health practitioner to discuss any worries is advised as is making sure that the vitamins that you purchase are clearly prenatal vitamins and not just normal adult multivitamin and mineral supplements.
When choosing a good prenatal vitamin always look at the folic acid content per serving. It is advised that a women who is pregnant needs 1000mcg of folic acid each day to help the baby grow at optimal levels. You can find good prenatal vitamins at your local or internet health food store.