It takes just an additional 300 calories on top of an adequate pre-pregnancy diet to support the healthy growth and development of a baby. That's enough to put together a nutritious and -- depending on your choices -- surprisingly robust snack. There's even room for candy in a healthy pregnancy diet, provided you keep your portions moderate. Here are 10 snack fixes that add up to about 300 calories.

1. One 6-inch roast beef, turkey or ham Subway sandwich on wheat bread.

Cold cuts provide protein and iron. Skip the cheese, which adds fat and calories. Say yes to veggies such as tomatoes and green pepper for additional fiber, vitamins and minerals. Note: Prenatal care providers recommend that cold cuts be heated to steaming before eating to reduce the risk of listeriosis, a bacterial infection that can be harmful to the fetus.

Total calories: About 300

2. Ten dried apricots (80 calories), 1 ounce almonds (about 24 kernels, 169 calories) and one stick string cheese (80 calories).

Apricots provide potassium and vitamin A, as well as a healthy dose of fiber to keep a pregnant woman's sluggish digestive tract moving. Almonds deliver vitamin E and protein; the cheese adds a calcium boost as well as protein.

Total calories: 329

3. One cup Raisin Bran (187 calories) with 1 cup skim milk (90 calories) and half a six-inch banana (45 calories).

The cereal is packed with fiber and protein and is fortified with numerous vitamins and minerals (even sugary cereals are fortified, so go ahead if you crave sweets -- just keep your portions in check). Milk adds calcium and protein, and the banana provides both potassium and vitamin C.

Total calories: 322

4. One Kashi Honey Almond Flax chewy granola bar (140 calories), one DanActive vanilla yogurt (90 calories) and half a cup seedless grapes (55).

The bar has fiber and protein; yogurt has calcium and active cultures to aid digestion and the grapes are high in vitamin C.

Total calories: 285

5. One small orange (45 calories) and a peanut butter and jelly sandwich made with two slices Nature's Own 100 percent wheat bread (50 calories per slice), one tablespoon peanut butter (about 100 calories) and one tablespoon strawberry jam (50 calories).

The orange is high in vitamin C and potassium; the sandwich provides protein and fiber. Be advised that some prenatal caregivers advise against consuming peanut products during pregnancy because they may cause food sensitivities or allergies in baby.

Total calories: 295

6. One packet Quaker instant oatmeal, Raisin, Date & Walnut flavor (135 calories), one small apple (55 calories), one cup 1 percent milk (100 calories).

The oatmeal is high in iron and essential vitamins and minerals; the apple provides fiber and vitamin C.

Total calories: 290

7. Lean Cuisine Beef burgundy spa cuisine meal (300 calories) or similar portion-controlled frozen meal.

This particular selection packs 17 grams of protein and is high in vitamin A. These meals can be high in sodium though, which may pose a problem for women with high blood pressure.

Total calories: about 300

8. Nine Triscuit crackers (180 calories), 4 ounces 1 percent cottage cheese (about 1/2 cup, 81 calories) and one cup baby carrots (50 calories).

The crackers and carrots pack a one-two punch of fiber, while the cottage cheese provides both protein and calcium.

Total calories: 311

9. Chick-fil-A chargrilled chicken sandwich. (270 calories). Tomato slices from home (13)

Protein is the star attraction here in this low fat fast-food choice. Tomato adds vitamins C and A.

Total calories: 283

10. One Snickers bar

This snack, which packs one fourth of a whole day's worth of saturated fat and few essential nutrients, shouldn't be an everyday indulgence if you're eating for maximum nutrition. But it's not a nutritional wash either, providing 4.6 grams of protein and even about a gram of fiber.

Total calories: 273