No books, no internet, no mother in law giving you tips.
Just a baby and parents. How does weaning occur naturally?
Is it when the baby starts to put things in their mouth (but this happens every young - 3 months?) is it when they start to crawl and grab at things (this can be much later, if at all if you're my second son).
Is it when the baby reaches out for the parents food?
How would a parent wean a baby before all science and knowledge?