When a woman gets pregnant, her body tends to change. Pregnant women should change their usual diet to provide more nutrition for the growing baby. Even though, you will find most of the vital nutrients in your diet, there could be crucial nutrients missing. To have a smooth pregnancy and improve the health of both mother and baby, prenatal vitamins are often taken when you are pregnant. 
Prenatal vitamins are specially formulated multivitamins that fill the gap of any nutritional deficiencies in the diet. These pregnancy supplements contain numerous vitamins, minerals and the right amount of essential fatty acids. Prenatal supplements contain high levels iron, calcium, folic acid and the right level of DHA Omega-3.
As the body changes in every pregnancy stage, the demands for nutrients increase. The daily diet cannot provide the adequate nutrition that your body needs. That is why prenatal supplements are necessary. There are many essential nutrients that a pregnant woman needs.  These nutrients are critical for the overall growth and development of your baby. Prenatal vitamins supplement the nutrients in your body.
Pregnant women need higher levels of folic acid, iron, and calcium, which the prenatal vitamins can provide. Folic acid is necessary for growing and maintaining new cells, vitamin B reduces the risk of neural tube defects, these vitamins are essential during the early stages of pregnancy. In fact, the U.S. Public Health Service has recommended women to take folic acid as early as possible as a preventive measure against complications in the early stages of pregnancy. 
Iron is a vital element that most pregnant women need to take. It is also an important component for any prenatal vitamin formula. If the iron level is low during pregnancy, it can lead to anemia and fatigue. Iron helps in developing red blood cells and delivering oxygen to the baby. Excess intake of iron can also harm both the mother and the baby but prenatal multivitamins contain the exact recommended amount.
Calcium is another critical supplement that you need for your baby. It helps in developing stronger bones and teeth for your baby. It prevents young mothers from losing their own bone density as the baby takes minerals for their own bone development.
You should take prenatal Omega 3 pregnancy vitamins, as it will help the development of your baby's brain, eyes and central nervous system.  Taking prenatal multivitamins does not end after you have had your baby. After giving birth, breastfeeding can make tremendous demands on your body. It can deplete your omega fatty acid content. Prenatal supplements that contain Omega 3 are necessary post pregnancy.