It’s just a stupid data source very wrongly extrapolated. This came some time back on Reddit and there is actually only two data points for France and the rest has been extrapolated.

The French have an attitude that has been broadening in that period that suggests independence is more valuable for children and that parents shouldn't be living for their children. The acceptance of this is likely becoming mainstream. Speaking as an American married to a European (not French), the societal pressure is to live for your children and sacrifice everything for them as if it's good so more must be better. As we shift to one child households this dedication to the one or two children becomes even greater.
I have no data to back this up. It's just my cultural experience and perception.

In source paper you can see there are more points for France, 1965, 1974, 1998–1999 and it shows dünne decline. So where you have your stated problem?

I did a lot of research the first time it came out, I will need to find it again. But this is the idea, how can you conclude on something on a graph finishing in 2010 where your last figure is 1999 that you are actually comparing to something from 1974. The precise content of the questions also was questionable as obviously they were not the same between the different studies.

There is also a difference about childcare infrastructure and at what age children do start school full time.

Moreover, I think you have to take into account the growing number of families relying on only one parent.

But as stated above, there is a lot of extrapolation from few data points.

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Did you by chance read bringing up Bebe?

My favorite part is the uptick in Father time pretty much across the board. And this only goes through 2010, so doesn't include any "pandemic effect" of possible shift in parenting dynamics required during the shutdowns. Go Dads!!

I did. Don't even have kids. I found it to be an interesting perspective. Our nephews and other European children are raised closer to American children. We have an American and French couple that are friends and the raising of the children fall along these lines of separation as well.