I honestly don’t get why people have more than one child.
In the Victorian days, it made sense to shoot out 10 kids because at least half would die young. So on the whole it made sense to ‘back up’ your children. At least you’d have some left by the time you actually stopped breeding.
But now, there’s no real need for a spare child. You just need one really.
Ok perhaps you have a girl, then you have a boy. A full set, so why have a third kid? Do you really need a spare? Is it incase one of you’re kids turns out gay and so you still have a full set?