Warrior tribe, yes, but they aren’t spartans. 5yo, author, 5yo. That’s the earliest you can start with the basics, with a non-reincarnated child.
Also, I hope that 2yo child doesn’t have the vocabulary of a 5-7yo.
The story started with a certain amount seriousness, and half a chapter of meaningless chatter with the imaginary friend was off-putting.
Tonyorobsky