one of the main tasks when being a child is to figure out how the complex world around you works.
This world includes different relationships-with parent,in particular.
At each developmental level, children learn what is acceptable in relationships with other people, and what is not - they are trying to see where the boundaries are (if any).
This makes a child constantly break the silence, so to say: shout,fight,be rude, or misbehave in any other way - each case is particular.
This may be frustrating for parents, who might start thinking that their child has gone crazy or is possessed by evil spirits all of the sudden , but in fact it is normal and necessary for a child.
During such periods, all parents can do is set the boundaries and consistently follow (Lifehack.org).