Seedsoul

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Seedsoul refers to a system member who looks like and/or acts like a child, but is not a child.

This can be for many reasons, such as, but not limited to, being in a median system, age regression or having a metaphor-based internal age instead of a development-based internal age, which is fairly common in DID/OSDD systems but not exclusive to them.

Seedsouled members may find it more helpful to be treated as their body's age, or they may prefer being treated as their apparent age. It's recommended to ask them what their preferences are, as it may not always be obvious.

Related Terms
A Sproutsoul is a member who looks like and/or acts like a teenager, but is not one.

A Oaksoul is a member who looks like and/or acts like an adult, but is not one.

Reference
https://the-mare-cognitum.tumblr.com/post/654655107267461120/flags