Maybe I am crossing the line, I am by no means about to give my daughter a knife (she is 3) but I have introduced her to them and she knows how to properly sheath and unsheath a knife by only holding the top of the sheath with her off hand and draw it with her dominate. She knows they are not toys and only is allowed to touch them when I am next to her. I feel she should be introduced to anything that is in my house so that she can at least recognize something as dangerous or safe.