I take my prenatal vitamins everyday could they help prevent birth defects like the one my husband had when he was born? could taking those help?

Depends on defect: I don't know what type of birth defect your husband had, so it's difficult to say whether vitamins will help prevent something similar. We do know taking Folic Acid in adequate amounts (present in prenatal vitamins), reduces the risk of neural tube defects (things like spina bifida). Thee may be other defects that are vitamin responsive - best ot talk with OB or maternal-fetal medicine specialist!