Talk:Seiji Komori/@comment-50.184.233.94-20150626062528/@comment-71.202.180.242-20150823063609

Actually, this exact discepancy was never addressed in the canon. Laito, Kanato, and Ayato are all allegedly 17 and there is no mention that they age any differently from Yui (other than the fact that they are immortal). It's also incredibly strange that an adult heart would physically fit into an infant and the baby would survive.

A fanfic writer amended these plot holes by stating that Yui actually underwent surgery for a heart transplant a few months before arriving at the Sakamaki household. This makes more sense, because the boys were already teenagers when they killed Cordelia in the anime. If you want to read the "fixed" version of the story, it's called "Revised" and there's even a sequel by the same author.