Yes crushed oatmeal. Both my daugthers would have really bad open soars diaper rashes and no matter what I did the rash would get really bad now and then. Tehy could spend days and nights diaperless. I never saw it get as bad as you describe however but both sides of our family was have serious skin sensitivities and diseases. So I would not bath them with soap everyday butt when the diaper rashes appear what really worked most was just soaking them in warm water and crushed oatmeal. However I also used a prescribed ointement.

I truly hope this little child gets the best care possible.