Many many years ago, for my hospital job, I was sent to an adult store to buy twelve 6" vibrators.
They were used on the backs of premature infants to help stimulate their breathing and help wean them off respirators. (For some reason the stock kept dissapearing and I was sent back again ....and again...
Wow, that is hilarious! I was a premature infant myself (born 3 months early at 1 pound, 6 oz.) but whether that type of back therapy was used on me, my folks have never mentioned it!

See, I learn something new every time I come here.