If you go to your Nutrition Tracker, at the bottom right you'll see a button that says "Change Nutrition Goals". Click there and you can edit your calorie range from that page. Just keep in mind that any time you change something about your goals (nutrition, fitness or weight), the calorie range will default back to SP's recommendations.
Hope that helps. Congrats on your little one!
"You may have a fresh start any moment you choose, for this thing that we call "failure" is not the falling down but the staying down." Mary Pickford