Oatmeal bath soothes diaper rash
A reminder that we don't always need fancy solutions..simple ones work just fine. From Sara:
My mother-in-law bought some fancy Aveeno bath soak for Miss J once, and it was basically oatmeal. Now, when she has irritated skin (diaper rash included), I just let her dump a 1/4 cup of oatmeal into the bathwater. It seems to make it feel better. (Wipe up oatmeal with a tissue after the water has drained out...)
I'd also suggest putting one of those plastic hair traps over the drain before you drain the tub just to keep the pipes clear.
Wait! I just found a hack from 2006 about this very topic, and Lisa (the author) suggested putting the oatmeal in an old stocking first! Smart people.