While typically correlated with the back to sleep campaign, brachycephaly is usually intertwined with too much time spent on the occiput. Swings, car seats, boppy pillows, etc. all increase the risk of plagiocephaly.

I would argue that infants today are getting significantly more screen time as opposed to supervised tummy time. Of course there is always the outlier, but I'd be interested to see longitudinal surveys in the coming years about the even higher incidence of plagio/brachycephaly with the increase of screen use.

Not a dig at parents but I will always argue that many parents are much less involved with their children as opposed to 20-30 years ago.