Day 1: Transmigrating into a Baby When babies are born, their eyes aren't fully developed. They can normally focus on items that are 10 inches from their faces. Eye control isn't very good and will start developing throughout the first few months. Color vision isn't well developed until roughly 5 months of age. Through the magic of transmigration, transmigrators that take over a newborn baby's body will magically not have this problem. Is it because transmigration allows the soul to rapidly develop certain parts of the body? (Why would it be the eyes? I'd rather be temporarily blind than have to wear a diaper). Could it be due to the difference in mental capacity; the transmigrator already knows how to focus and control the eyes. Maybe newborn eyesight isn't due to the need to strengthen muscles, but due to the knowledge of what muscles to use. ...more research required.
Honestly if your aren't cultivating as a fetus as a transmigrator, what are you even doing with your life.
From what I remember from my middle school health class, you have to learn to focus and control your eyes accurately. As transmigrating is essentially your mind transporting to another body, you would have already learned to subconsciously do this process. Also if your transmigrating to a baby, isnt that just reincarnation?