I have 3 kids, I can tell you that these things either last forever or turn into the most god awful slurry of mush you'll ever see. I wouldn't recomend using them in the secondary unless you want them to first swell into a massive cheerio paste and then dissolve into a bottom sludge, the like you've never seen. I can't imagine they'll offer any benefit since everything will be cooked out of them in the cereal process. Just use Flaked oats.
[SIZE="1"]Primary 1: Beach Bum Belgian Peach Ale
Primary 2: Farmhouse Rye II
Primary 3: NSB Test IPA
Primary 4: Hair of the Dog Breakfast Stout
Primary 5: Wrong Color IPA
Primary 6: Ginger Beer
Primary 7: Wonderland Winter IPA
Drinking: WAAAY too many to list.