I'm thinking of giving my baby a knife to play with.
Why would you give a baby a knife? They could hurt themselves.
How can a baby hurt itself with a knife?
Your baby could severely injure or kill himself with a knife and it should be taken away from him immediately. You never give a dangerous weapon to your child, especially not a baby.
I can't just take a knife away from my baby, that would hurt his self esteem.
You absolutely need to take it away from him before he gets hurt. Why not just let him have a toy instead?