Desitin works well. I've also started using Lansinoh on my baby which creates the same moisture barrier. Also, make sure you're not overdressing your baby. In Hong Kong babies are usually overdressed because everyone is afraid that the baby is cold. If your baby's clothes are damp from sweat then she is overdressed. Today we were out and we only had my daughter in a onesie and people were so alarmed that she was going to get sick. If only they would feel her hot, sweaty body and realize that babies have baby fat for a reason--they are usually warmer than adults. If you can reduce moisture and sweat this may help. Also, if the problem persists, you may need to treat your child for thrush/yeast as this often is the cause of persistent diaper rash. Don't use any type of perfumed lotion on your baby and definitely leave that diaper off for awhile to let her skin dry well.