Answer:
Recent research indicates that: the mother is mistaken. The kids with agressive or problematic behavior such this, if not controled then, it would become worst in time.
Step-by-step explanation:
It is very important to take notice and action over a kid's behavior such as this. It is not true that a child goes through a stage of agressiveness. This is a behavior that needs to be stopped otherwise it would lead to complitcations. If a wrong behavior is not corrected at the age of 5 it would become worst.