Who would have thought that 21-month-olds are predisposed to Kantian ethics?
Hint: its true even if babies haven't figured it out yet.
If you take the deontological view then this is still a fairly complex behavior to execute. To consider whether this sort of judgement is one that should be fairly placed on the 21mo if it did the same is a challenging mental task.
So, perhaps babies are predisposed to heuristics which favor the categorical imperative. That'd be interesting and certainly worth surprise.