A facet of Babywise that most people who use it love is that baby is a part of the family rather than being the center of it. You welcome baby into the family. The family doesn't stop life completely because there is now a baby.
There are many benefits to this. One is that your child will have less risk of being self-centered. Another is that as the parent, you still get to have your other relationships. You still get to be a sister, a daughter, and a friend. You can still join that choir. You can still do the service activities you enjoy. You can still exercise. Most importantly, you and your spouse can maintain a strong relationship. Looking down the road, you can imagine the difficulty that would arise if you plan to have more than one child. It is hard to have more than one center of the universe. You want your children to all be a part of a family.
I want to offer a word of caution with this idea, though. When welcoming baby to the family, be sure you welcome baby to the family. What do I mean by this? If this is your first child, you welcome baby to the family, not to the "couple." The idea of welcoming to the family does not mean that you as the other family members do not have to make any sacrifices. It simply means the world does not revolve around the baby.
There will be many sacrifices to make. At first, you might go all day without getting out of your pajamas. You might get to lunch, or dinner, and realize you have yet to brush your teeth that day. These are sacrifices that come as you get used to juggling your time. Just as the world does not revolve around baby, it does not revolve around you.
You will still be able to entertain friends and go places, but you might cut your evening short in order to care for your child. Life cannot continue on as it was before baby came. Things must change. This is true even when you are welcoming a second or third child (etc) into your home. Everyone sacrifices. Everyone gives a little. Some times call for more sacrifice from some than others. A newborn benefits greatly from consistency to get things established. During the weeks it takes to get established, others might need to sacrifice more. Once baby is established, less sacrifice will be necessary from the other family members.
As you welcome your new baby into your home, be sure the world revolves around the family as a whole rather than around an individual member. Life changes with a baby, just as it changed when you got married. Adding a person to the mix will always change things. Through implementing the principles of Babywise, you can make these changes easier on the entire family unit.