TMI toddler poop help

Je

Okay so this is my 19 month olds second diaper that looks like this today. I’m not exactly sure what would cause this color, I kept going over everything he’s ate. As I typed this I remember we went to a birthday party yesterday and the icing was BRIGHT pink and it stained your skin so I wonder if maybe that could be the cause? He ate quite a bit of the icing. Any ideas? Should I worry?