Does a baby need diaper cream/diaper powder after every change?

My little one is due in a week, and I seem to be pulling my hair out over getting every single thing done, and making sure I have every single thing down. Which brings me to the question that may seem extremely stupid to ask but does a baby need diaper cream/ointment or diaper powder put on their little bumbs after every diaper change? I've also heard that Vaseline/petroleum jelly works great at diaper creams, true or no???. Ahh!!! I think I just lost a bit more hair from pulling! Help!