@IrregularPerson
Absolutely right. I don't think that current level of child-adoring behaviour is unhealthy at all. There is zero sexualizing, let keep it that way. I just can't think of better words, because pedophilic have much more negative nuance, for all it mean 'liking children'.
The alchemist never regress into a child. She just never progress into adolescent. With her age, I think she already threw some tantrum in past just to learn that it doesn't help at all.