As a millennial who just had a baby girl, I can't imagine being so disconnected that I hadn't changed a diaper.

I think parenting in general for both sexes is more involved and the expectations are much higher that it was for our parents. Making sure you get x tummy time or do y development activity or z social development classes with other babies etc.

I also think parents today are having kids more by personal choice than societal pressure. So they are more engaged and less "just going through the motions of what society expects".