In 19th-century Italy, wealthy families sent their newborn children to wet nurses until they were two years old.
When the child returned, he or she didn't find the loving environment we would expect today, despite their economic comfort; instead, he or she was subjected to a strict upbringing.
This was the most widespread family model, but the intellectual bourgeoisie was creating a new one: the "intimate conjugal family." Find out what it is in the related video.