[Spoilers] Could Gen 3 Synths grow?

Obvious spoiler alert for the Main quest.

So, the gift that is left for the player character after finishing the story. Synth Shaun. Is it possible for Synth Shaun to grow into an adult or will he be stuck as a child until the end of time? I remember another post on this subreddit saying Gen 3 synths are made from synthetic living material, with only a mechanical component in the brain which is responsible for the recall codes to work, but the question remains: Could Synth Shaun grow into an adult? (in theory, at least)