Not quite: “By the end of the nineteenth century Americans and western Europeans had arrived at a specific definition of a “modern” childhood, in which children could expect a number of things: that their childhood and youth would extend through adolescence, that their schooling would extend beyond a basic education, that many of their families’ social and economic resources would be devoted to their happiness and nurturing, and that they would increasingly be integrated into the developing consumer culture.” from The rise of “modern” childhoods by James Marten, Oxford Academic.
Also involved: the industrial revolution, the rise of the Middle Class, advances in technology and health care, better and more widely available health care for women and expectant mothers (now being aggressively reversed in certain parts of this country) and a resulting drop in maternal and child mortality (ditto).
So, yeah, to a large extent, a “modern” invention if you trace modernity back to the late 19th century. But not “upper class” because of the emergence of the middle class which began in the mid-19th century, IIRC.
I think “G-Spot Blues” might be a good name for a band.