Not really OK, not, that newborn was clearly HUNGRY and it was cruel and wrong to leave her unfed while mum wept downstairs just to 'satisfy' the demands of a regimen which is totally against the instincts of a parent, not to mention common sense and the example of those in non-western societies who raise children without a parenting book in sight.
However as I posted on the other thread, I was raised that way, and while it was agony for my mum, I thrived fine and turned out extremely affectionate and calm by nature, which you wouldn't expect if you made the obvious prediction.
But no, I'm not saying it was OK at all, I wanted to kick CV out and let the mum run upstairs to feed and cuddle the poor wee mite. Mad and cruel.