How are later-born children different from first-born children?

Answers will vary. Differences in personality and achievement have been linked to birth order. Later-born children may learn to act aggressively to compete for the attention of their parents and older siblings. Their self-concepts tend to be lower than those of first-born or only children, but the social skills later-born children acquire from dealing with their family position seem to translate into greater popularity with peers. They also tend to be somewhat more rebellious and liberal than firstborn children.