Originally Posted by Maddy'sMommy:
From what I understand, you want to put the food you are going to feed your baby in a bowl, because after the spoon has been the baby's mouth you would be introducing bacteria back into the food. Whatever you don't finish from the bowl should be thrown out. If you put the spoon in the jar, you'd have to throw out the whole jar.
3-5 days in the general amount of time to wait to wait between new foods. Start with rice cereal, and then introduce other single-grain cereals after you are sure there is no reaction.
Edit** Ooops! Someone else answered while I was taking my sweet time watching Law and Order while I typed. lol.
Better change foods from original jar to plastic/glass food containers while feeding.