The approach we took was to introduce new foods to DS as a SINGLE food and waited several days before introducing another NEW food.
That way we could check and see whether our DS had any sort of reactions to that food.
We concentrated on introducing foods that could be used as ingredients and would allow us to start cooking and combining foods.
Cinnamon is not highly allergenic, but IS an IRRITANT so sometimes LO get a flat red "rash", especially if a large amount of cinnamon contacts their skin.
Cheeses & yogurt are okay to give before one. Just supposed to hold off on drinking cow milk until after one because don't want drinking cow milk to replace nursing.