I don't know if it's American but it's not universal, especially if you go back in time.
There was a time in Europe where children were considered a bit like wild animals who needed to be "civilized" as they grow up into adults, who had a good chance of dying of sickness before they reach adulthood anyway, and who were plenty because there was not much contraception.
Also fathers were considered as "owners" of their children and allowed to do pretty much they wanted with them.
In this context, of course hurting children was bad but it wasn't much worse than hurting an adult.