Yes, these things will change, but if you stay focused on moving your body nearly everyday of the week, you will begin to see the results you are looking for, as well as fitness become a part of your daily life.
Some days, you will not feel like doing anything and keeping your child alive will be enough of a task in itself. Other days, you will run, jump, push, and then some.
Enjoy downtime and take advantage of the days you have extra energy.
Work with your body, not against it.
Finding a child-friendly fitness class that works for you is also a fantastic way to stay active throughout the year and meet other women in similar stages of life to you!