You shouldn't tell children that they are small and weak.
Mike and his young son are moving bricks into the house to make a wall.
Mike wants to talk to his son about his brick carrying.
Mike tells his son that he's proud of his effort in carrying the bricks.
Mike tells his son that he's not strong and big enough to carry the bricks properly.
Mike's son will have confidence and enjoy helping his father.
Mike's son will feel depressed and not like being around his father.