How many hours of sleep do you get on average everyday? Parents expect a lot from themselves, while they run on very little sleep. Did you realize that if your body isn't properly resting, it's difficult to maintain a health body weight?
I want you to take a little sleep inventory. How much continuous sleep are you getting? Any naps?
If you aren't getting at least an average of 5 hours of continuous sleep in a week, weight-loss should not be your focus right now. It is not a realistic goal to expect from your body.
I'm talking to you, sweet-mothers-of-6-week-old-babies-who-think-they-need-to-start-dieting-RIGHT-NOW... No, you do not. Sleep. Sleep every chance you can. Don't stay up reading a book. Don't stay up reading blogs, washing dishes, doing laundry. If at all possible, sleep.
How do I know this? Let's just say I speak of what I know. My babies are not sleepers. I do not make children that sleep well at 12 weeks old or even at 3 years old.... If you are able to get a good night's rest then absolutely, you may move on to your next health goal.
Now let's say that your kids are sleeping well, but you just do not have good sleep habits. Before you set about a new exercise routine and a new diet, you must better your sleep quantity and quality.