I think at that age, poo blowouts are a fact of life! I know my dd would save them up for a few days, and boy oh boy, was there a lot of poo. Ugh. Anyhow, like someone else said, the key to containing those poos is a good-fitting cover. Pinning or using a snappi will help, but a good cover is crucial. My dd had skinny legs, and so aplix PUL covers with leg gussets worked for us. Once we found the right cover for that stage (we used Diaperaps) we never had a blowout that went outside of the cover. At that point we were just trifolding the CPF too, and the cover was still able to contain all the poo. Impressive!
~ Meredith, mom to dd(Jan '02), ds1(May '04) and ds2 (June '07) ~ :