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Ah, you beat me. Get that cedar bedding out ASAP. That bedding releases phenols which damage the linings of their respiratory system and makes them prone to infection and other problems.
In addition to that, keeping them at 72F probably gave them a really hard hit. They would normally be under the hen about 80% of they day for the first week of life and a hen's body temperature is about 102F. Put a thermometer under the heat lamp and make sure it is at least 90F. If you can get electrolytes for their water, that will help them get back on their feet, even sugar water may help right now.
Welcome to the board and I hope you can find all the information you need in order to make your chicks better!