This is one time it is better to ditch the vitamins and increase good food. Developing fetuses start out very small and as a result are probably more susceptible to DNA breaks as they rapidly grow to delivery weight. article article Since vitamins are quite concentrated, this presents a challenge for the body to control while it is preparing for a new life. The Placentia usually does an excellent job of monitoring and holding back potentially toxic elements from entering, except alcohol. This control shows up the real advantage of natural vitamin E over synthetic. The Placentia recognizes the difference. This is one time that certain organic foods would be wise, like apples and strawberries since these are two of the most chemically sprayed crops.
Hopefully, before becoming pregnant, women should have already been taking some extra folates. Plus there is extra pressure put on maintaining mineral content of bones during pregnancies, especially the last trimester. Doctors monitor these situations. Special conditions like pregnancy reveal the subtleties and nuances of proper vitamin supplement use.
There are two concepts here that need addressing. First, there is the nutrition of the Mother. Next, there is the nutrition for the developing fetus. Fortunately, or unfortunately, what the Mother eats and does has to satisfy both conditions.
If you are inclined to include a pregnancy multi-vitamin, or unwilling to eat a good diet, pick a prenatal multi-vitamin with very low dosages. It may be wise to even reduce the number of pills per day. Best ones usually list taking 3-4 a day, so 2-3 might be a wise choice. A one a day is pretty much worthless since very anemic in minerals, but may go overboard on small molecular size vitamins. Consult a Nutritionist.