Failure needs another attempt.
What children need is not to avoid failure, but a structure in which failing still leaves the next attempt open. At an overnight camp on the north coast, a team failed a task three times before solving it themselves; the leader beside them did not step in with the answer. That was deliberate. The next attempt was still theirs to make.
Read: Before a Child Can Learn From Failure, Failure Needs a Second Attempt — English adaptation in preparation