Change every diaper. That’s my first piece of advice for one of my best friends, Muppus, who just had a healthy baby boy. (We call him Muppus because that was the name of his band in high school.) I’ve benefited from the advice of Muppus on so many extremely important things – like how to build the perfect fort — so I thought sharing all the things I learned as a parent of two boys might be a nice way to pay him back.