A head and neck protector device is disclosed that provides an additional layer of physical protection by stabilizing a child's neck and upper body in case of an automobile accident. The head and neck protector device comprises a restraint strap and a clasp. The restraint strap comprises a cushioning component and is designed to wrap around a child's car seat and be removably secured together, end to end. The clasp comprises a male component and a female component, which matingly attach together to secure the restraint strap. The head and neck protector device further comprises a pair of brackets, which are secured to opposing sides of the child's car seat, and comprise an opening for receiving the restraint strap. The brackets can be permanently secured to the sides, or a pair of positioning components can be used to removably secure the brackets to the sides of the car seat.