Children do not come with an understanding of who they are, how they should behave, or what is their potential. A child looks to parents and adults to tell them who they are. If a parent tells a child, "You are a bad kid. You never listen to me." That parent has just provided a blueprint for their child's behavior.
Speak positive, encouraging words to your children. Tell them they are loved. Tell them you are proud of them. Tell them you you are confident in their abilities. Proverbs 18:21 Death and life are in the power of the tongue.