Some children tend to fight more than others because of their temperament. Arguments between siblings is fairly common thing which may not be noticed in most cases. But sometimes conflict between siblings may be because of sibling rivalry. If a child is noticed to be jealous of the younger sibling since the time birth and experiences emotional problems such as hostilityand unhealthy competition, this problem should not be taken lightly. Often, in sibling rivalry, the child shows childish behaviour, which is not common at their age. There may also be sleep disturbances and anxiety in the child.