When can I stop putting diaper rash cream at night? Does it only stop when they are potty trained?

My son is 11months old. Till now, no diaper rash. Never used any diaper rash cream. If no rash then no need to use rash cream. Whenever possible, better u wash with water rather than wipes. Leave the baby without diaper at least for 1hour. For my son, these 2tips works well.