Teenagers having bizarre fetish's

I've posted about this on reddit but also wanted more advice. So is it normal for a teenager to have a fetish.... I accidentally found out my 16 year old has an extremely bizarre fetish and idk how yo handle it.... I found out because I went through his phone and found his stuff.... I just don't know if this is too early to have a fetish.

Edit: The fetish seems to be age play/littles and I'm positive because I found pacifiers and diapers and other stuff in a box under his bed.