To make the sign for knife, make a knife with the index and middle finger of your dominant hand, and a surface with the same fingers of your non-dominant. Finish the sign by making a back-and-forth cutting movement.
The sign for knife is best for a toddler who is out discovering the world around him. Start with butter knives, or use the sign to teach your baby that he or she must stay away from dangerous knives.
Babies are full of curiosity and they will soon figure out that mom and dad often use knives. Teach the sign contextually during meals by telling your baby that you will cut their food with a knife.
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This is a nicely written article. Lots of helpful tips and suggestions. Good job.