Extreme baby diaper rash

vivs • I`ll be honest with you.

I need help 😭 my babygirl is only 3 weeks old and has an extreme diaper rash. It’s all red since yesterday. I’ve been very very consistent with her diaper change and been using desitin cream on it, but nothing is helping. She’s in pain because when she poops and i change her she cries. I need help !!!