There is nothing to stop you saying that Maj, and we know you probably prefer pizza - but the poor child would probably be terrified!!!
Is that a common thing to say in Spanish? Are there many kids there that bathe in Tabasco to help deter such attacks?
P.S. I am not really the right person to suggest 'kid friendly' expressions. Most kids run screaming just from looking at me - before I even get my chopsticks out!
Hopefully someone with better experience with ankle biters .. oops, I mean children, can help.