Babies don't even realize how much they need this. They don't have the mental capacity to know pain until they experience it. One moment they are chilling, and the next moment they are feeling a horrible pain they've never felt: soap in the eye. I remember when I was old enough to be able to read shampoo bottles I would see the children's shampoo bottle say "tear free." Unfortunately tear, as in "to rip," and tear, as in "to cry," are spelled the same, so there was some confusion at first. Once I learned that it meant that it could get in your eyes without any tears, I poured it right into my sockets. Turns out it's a lie, or at least it is when you pour that much into your eyes.
As an adult I wish I head tear free shampoo. You think adults want to cry too?