"Sure a baby has a swimming reflex but that doesn't mean watching them swim isn't absolutely terrifying."

Says a Metafilter participant, linking to several videos. I watched these videos and didn't find them terrifying at all. These are people teaching babies ISR — Infant Swim Self Rescue. The babies are learning how to save themselves from drowning. Immersed in pools, with supervision, they learn to roll over face up and stabilize themselves in a position where they can breathe. I was inspired by the success of the babies in learning a very specific and highly useful skill. Hooray for the babies!

As for the people on Metafilter (and in the comments at YouTube) who think it's terrible to scare babies and make them cry.... Well, all I can say is maybe they don't know any babies. You don't melt into a pool of sympathy when a baby cries. You deal with whatever the situation is, if you can figure it out. By the way, a drowned baby doesn't cry.