Losing yor pregnancy weight can be really frustrating, but it is possible! Those crash diets will make you sick.
I was fortunate to be back to my pp weight within 5 months of having my dd, but not without effort! (Getting back to my original fat-to-muscle ratio took a few moths more.) Cutting calories and exercising will help, but that means doing it the correct way and being honest with yourself about what's really going on. (Anyone about to flame me, please note that I am not one of those people who was "born skinny!" Weight was always a struggle for me! One day I just got fed up and started really exercising and eating right. Said bye-bye to 30 extra pounds and have been happier/healthy since.)
I don't mean to sound like a fitness magazine but one thing you can do is keep a journal of all the food you eat. All the food, every meal, every glass of juice, every stray potato chip and nibble of carrot. Do it for at least a month. You'll be able to look back and assess your true calorie intake,and also spot the times where you are most likely to overeat. (I know I always want chocolate around 9pm.) Read food labels to find out what's really in your food. Many products are billed as "healthy" but still have tons of calories/saturated fat.
A few suggestions for things that may help: 1) Eliminate white flour from your diet and eat whole grains instead. This is way healthier for you whether you lose wieght or not. 2) Try "perimeter shopping" in the supermarket. Generally, the fresh fruits/veggies, dairy, and other whole foods tend to be located around the outer perimeter of the supermarket, while the processed foods are in the middle rows. The less time you spend shopping in those middle rows, the better off you are! 3) Definitely don't go to the supermarket without a shopping list! 4) If it interests you, eating vegetarian meals once or twice a week may help you lose weight, so long as you don't take it as an opportunity to eat lots of heavy sauces and cheese. 5) If you think you're hungry, drink a glass of water and wait 20 minutes. If you're still hungry, then have a nutritious snack. These are just some thoughts that have worked for me and others I know.
Motherhood tends to make us slightly more sedentary than we were before we had babies. If we SAH we tend to be cooped up a lot, especially in winter. Even if we work our evenings are generally spent at home instead of going dancing, etc. So even if you're exercising, you still need to find ways to work more activity into your daily routine. I mean little things like doing calf raises while you hold the baby, going for walks, or dancing with your baby. And doing your regular exercise on top of that. It's effort at first, but after a while it becomes second nature, even enjoyable.
I really feel that healthy weight loss isn't possible without exercise. As you begin to exercise, you may not see the scale budge at all. When you start to exercise you will gain muscle mass, and muscle is very dense - so even if you lose some fat, the muscle mass gain will make it appear that you haven't lost weight, or that you even gained weight. It usually takes a few weeks for the scale to move. So don't get discouraged right away! You need to get moderate cardiovascular exercise for 1/2 hour or more at least 4 days a week. Walk, run, pop in an exercise video - whatever you enjoy doing. If you don't like it, you won't do it. You can also try adding some strength training to your routine as that will boost your resting metabolism. (i.e. you'll burn more calories while you're just sitting there.)
If, after all of this, you find that your weight still won't budge, or you are gaining weight, see your doctor. Some women develop problems with their thyroid after they have a baby, and an underactive thyroid can lead to weight gain, depression, etc.
Remember also that all of our metabolisms slow down as we age. The amount of exercise that was sufficient to keep you looking fit at age 17 won't cut the mustard today. (Unfortunately!)
In the meantime, love the body you've got today and honor it by taking the best careof it that you can. You'll be such a great role model for your child!
So I've rambled on loooooooonnggggg enough, hope some of this helps! Good luck to you!