https://schooling-frontier.pages.dev/tags/birth-order/ Recent content in Birth Order on Schooling Frontier Hugo en Thu, 23 Apr 2026 00:00:00 +0900 https://schooling-frontier.pages.dev/posts/second-child-vocabulary-not-about-birth-order/ Thu, 23 Apr 2026 00:00:00 +0900 https://schooling-frontier.pages.dev/posts/second-child-vocabulary-not-about-birth-order/ An analysis of 6,163 Norwegian children found that “who is available to talk to this child” explains vocabulary development better than where they fall in the birth order — and older sisters start filling the caregiver role one to three years earlier than older brothers.