My wife is week 4 pregancy and doctor prescribed miprogen and folvite (folic acid). So these are helpful for our baby?

Normal . Folvite is simply folic acid. All pregnant women are given this. Miprogen is a form of Progesterone supplementation. Many doctors prescribe this for a variety fo reasons. It is a common treatment. If you do not know why you were given this then please ask your doctor for clarification.