Babies see themselves as the center of the universe. They expect to be indulged. For the most part, they are. Left to their own devices children can be selfish and demanding. Taken to the extreme they can try to dominate others physically and psychologically. As they grow out of their babyhood they are expected to learn consideration for others. Unless that behavior is interrupted in the formative years antisocial behavior will become more pronounced as they grow to adolescence and adulthood. It’s up to the parents to show the child that, while a certain degree of assertiveness is acceptable as a way of making their way in the world, the instinct must be moderated in the very young before it can turn into unacceptable behavior beyond adolescence; spousal abuse, criminal assault, sexual assault, workplace aggression, etc.