If the child can sleep through nights already happened and no diaper changing, red Popo comes quickly, although diaper is expensive (even Japanese brands) or low of the store or D. R.. But after a bowel movement you should really change diaper as soon as possible, children's skin is very thin and delicate ... We use Bübchen every night and it works great - we sleep, child sleeps, Popo is not red, wallet is not empty ( We use satisfied at the end of very cheap diaper), all.