My SO wrote a blog post that touched on the fraternal birth order effect which I thought was great (though I am biased): https://obscuredinosaurfacts.com/blog/p

My SO wrote a blog post that touched on the fraternal birth order effect which I thought was great (though I am biased): https://obscuredinosaurfacts.com/blog/post/2021/01/27/bayes.html https://obscuredinosaurfacts.com/blog/post/2021/01/27/bayes.... She expands on it and I think her writing breaks it down well (just make sure to check out the appendix correction too!)