Soldato
Depends on what happened - if we're talking about a casual remark along the lines of just pondering wha the kid will look like then sure, could be anyone at say a dinner table or social event or whatever...
But if it's in the context of some serious discussion about Harry's relationship/future, his role/place within the family etc.. and raised as a concern regarding that then realistically there are only a few Royals who would be having that conversation with him - the Queen, Prince Phillip, Charles and William.
Again. Anyone MAY of said it.
We only have hear say.