J.P.
Hi A.,
I went through the same thing recently with my 15 month old, all of a sudden he hated and screamed through the bath. Like a couple people suggested, I bathed with him which worked. However that got old (for me!) after a couple days so I tried bathing him in a bubble bath (just used the bubble bath I use) and he LOVED it! He had fun trying to find his toys through the bubbles. I kept using bubble bath for a few days, and then weaned him back to regular water and now he's fine again....good luck!
Jen