I may not be an expert on many things, like soccer, but I am an expert on biting.
When my son, at age three was a biter, I solved the problem. I went to the closet, and got our dog Bo’s leash.
Then I held the leash in front of my son and said,“If you act like a dog, then we will have to go to the vet and get dog shots.”
My son never bit again.