Your words shape how your child sees failure. "You failed" vs. "That didn't work yet" creates two different futures.
Growth mindset language: "You're not good at that yet." "Mistakes help your brain grow." "What did you learn?"
Fixed mindset language: "You're just not good at maths." "You should be able to do this by now." "That was stupid."
Growth mindset doesn't mean participation trophies. It means failures are data, not character flaws.