At this stage, it is your child's tendency to be oppositional. In your child’s development phase, when they begin to understand that they are separate from you, they know that they can exert some control over their world. In simple words, they just throw tantrums!
What you need to know
You say, “Do this,” and they simply say, “No!” The drive to assert one’s self is useful as it motivates your child to want to make things happen. Being able to do some things for themselves builds their confidence. The key is to find ways to show your child how they can be in control and make their own choices in positive ways.
It’s important to keep in mind that some children are simply, by nature, more likely to be oppositional than others. Children whose emotional reactions are big and intense, as well as children who are more cautious and timid, may be more oppositional than children who are temperamentally more easygoing and flexible. Why? Because these children tend to have a difficult time with changes, for example, getting into the car seat, going to bed, or visiting a new place.
What you need to do
Talk to your child and figure out what's triggering the tantrums. The factors can range from built-up frustration to lack of attention from family. In any case, guide them well to come out as better human beings.