You've just embarked on an exciting nine-month journey. It promises to be one filled with all kinds of memorable moments.

As with any important trip, you want to prepare as much as possible. And make sure you have plenty of fuel to get there.

A Balanced Diet

Obviously, in this case, fuel comes in the form of food. Since you're not the only one going on this long ride, it's important to fill up on the most efficient fuel available. In other words, get the most out of what you put into your mouth. Eat nutrient-rich foods, like vegetables, fruits, lean meats, meat alternatives, and whole grains. The fats, protein, carbohydrates, vitamins, and minerals you get from these foods are critical to the development of your baby's brain, eyes, bones, ears, and heart.

To make sure you cover all your nutrient bases, you might want to block out your food plan in advance. Balance, moderation, and variety are not just good bywords for life but for eating, too. If you're low on a certain nutrient at one meal, make it up at another. If you're still worried that you might be missing something, ask your doctor about prenatal vitamins and minerals.

And make sure you drink plenty of water. Not only will it help your body transport important nutrients to your cells, but it will take away waste that's not good for you or your baby. Water will also ward off dehydration and related fatigue.

Looking for an energy-boosting trick? Eat a snack. This is especially true if you're finding large meals a challenge. Snacking is a great way to keep those nutrients flowing when you're on the go.

Weight Gain

Even though you're eating better than ever, you'll gain weight. After all, you've got a growing baby on board.

How much can you expect to gain? On average, 25 to 35 pounds. Naturally, this will vary depending on your body type. If you're thin, you may need to gain a little more to store the extra needed energy. If you started out a bit heavier, you might gain less weight.

Of course, you're not the only one gaining all these pounds. Your baby accounts for about 25 percent of this extra weight. His environment, the amniotic fluid and placenta, makes up another 10 percent. The remainder goes into your body's "support services." Your blood volume and breast and uterine tissue have all increased, as have your fat stores. If this makes you flinch, remember that these temporary deposits are a necessary source of energy for your baby. And will help give him the best possible start in life.

There's one more thing to keep in mind. Putting on those 25 to 35 pounds doesn't require a lot of extra food. During your pregnancy, you need only about an extra 300 calories a day. But these calories should be packed with nutrition. Make yourself a turkey sandwich with mustard on some whole wheat bread for a healthy 300-calorie snack.

Your journey will go a lot more smoothly if you use the right fuel.