First hand account here from back in the 80s of grandmas chewing adult food for babies. No they were not birds but humans, all of them. Make what you want with this information.
I read a comment recently by a person born in an Asian country, where it was normal for babies or children to be fed by their parents “pre-masticated”. Makes complete sense to me. You might also do it for someone who was ill.
They mentioned that getting fed food was something they still occasionally did, that it was a supremely intimate thing to do.