C.M.
Hi! My daughter would bite things out of frustration as well. The doctor told me children that around 16-24 months children can go threw a phase where they might bite things or bang there heads. It is all out of frustration. They know what they want but they do not know how to say it. It is just a phase. I started to take away the toy she was biting for the whole day and as I took the toy away I told her to "tell mommy "help" and I will help you"( I stressed the word help) and I would say "We don't Bite. It is mean". After about a month of that she stoped and she now asks me for help when she gets upset and no longer bites. For my daughter it was just a matter of her learning the words she needed when upset so she would not hit the boiling point which was biting. Good luck.