I am not a diaper expert, it depends on whether you consider a grandparent sufficiently experienced to rate a diaper. My appropriately sized grandchild fit into the diaper in the manner expected. The diapers fit well, were easy to put on and I appreciated the little Mickey Mouse faces. My wife pointed out that the gathered top provides a better fit and should prevent any over the top issues. The baby could care less and is only concerned about how rapidly you can get the dirty diaper off and the new diaper on. This diaper costs out at $0.18 each compared to the "step up" diaper from Huggies which is $0.26 each. I am sure there must be some difference but it is indiscernible to me. This diaper appears to function well and fit well. I have no idea if it really offers 12 hours of leak protection as I can't imagine not changing a diaper considerably sooner than that. (BTW my pun background is a result of a father ...