Postnatal vitamins have similar nutrient levels to prenatal vitamins. But every brand is different so it's important to do your homework. This WebMD article shows you how much of certain vitamins and minerals prenatals should contain http://www.webmd.com/baby/guide/prenatal-vitamins Compare this to your postnatal vitamin and check with your doctor. Many women are getting their vitamin D levels checked during pregnancy because when levels are low, they will need to take higher levels (typically more than what is in a vitamin). And prenatal vitamins don't contain all the calcium you need so you need to make sure you get enough in your diet. DHA is also recommended during pregnancy so if you aren't taking it, check with your doctor. Congrats on the pregnancy!
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