Pre-brady I figured a baby would change things, but it really changes everything. Your sence of normality changes, there really isnt a normal anymore. Who you are, and who you think you are all changes. Relationships change too. You look at your mom and dad from new eyes. Everything that had been ~just the way things go~ with your spouse changes too. Your basic needs go to the wayside for the needs of someone else who is completely dependant on you.
I dont think anyone can truely understand how a baby changes EVERYTHING until they live it. It presents a whole new challange in your life.