by 1960 it is estimated that 55% of photos were of babies.
the 20th century was the golden age of analog photography peaking at an amazing 85 billion physical photos in 2000 — an incredible 2,500 photos per second.
When the first few hundred thousand digital cameras shipped in 1997 their memory was strictly limited (in fact cameras like the Sony Mavica took floppy disks!).
That might sound implausible but this year people will upload over 70 billion photos to Facebook, suggesting around 20% of all photos this year will end up there.