Welcome to planDisney, Roxanne!
I have a fellow five-year-old, and I will tell you that although he will wear a
MagicBand, he has lost more than one. So if your little guy will not wear one, I absolutely think that you are making the right decision using an alternate method of theme park entry for him.
Roxanne, while you can use your MagicBand for your admission to the theme parks, it will not work for your son's ticket. What you can do is set up a
MagicMobile pass for your son. You can easily set up a MagicMobile pass through your
My Disney Experience Mobile App.
I hope that this answered your question, Roxanne.
Have a magical time!
Sarah B.