Is it child abuse if your child has minor lip injury because she was biting her lip when parent smacked child in mouth for being sassy?

"Smacking" your kid in the the mouth that results in a visible injury or blood being drawn, in my opinion, could be construed as child abuse. Others may differ, but I believe child protective services would be concerned if called upon to investigate such an incident. Whether or not it serves as a basis for a child abuse restraining order or to modify custody and placement, that would be best served by contacting an experienced family lawyer to investigate. You also might want to document the incident by taking photographs of the child and or if serious enough of an injury, taking the child in to their pediatrician; the doctor, if they believe abuse occurred, is obligated to report the incident to the police and/or child protective services.