Must Haves For Baby

My dear friend is pregnant with her first baby, a boy, and is asking moms what they think are the most important things to have when baby arrives. So, I figured I would pose the question here. What were the things you could not survive without when you had a newborn? What did you use most often? Remember, this is her first baby. Another friend and I were discussing how there were some things we used all of the time with our first babies, but not as much with later additions. I think I'm just as curious to read all of your thoughts! Thanks for your help!