What MIAinVA is stressing on is what pretty much every doctor stress on. Women lose a big chuck of nutrients from their body after the baby is born. Its important to take vitamins and other good stuff when pregnant. A lot of time just a good balanced diet is not enough because your body is developing a baby inside you.
Also what she said about Osteoporosis is right. Sometimes negligence can cause all kind of deficiencies in our body after delievery.