I tried this on my 28 month old around 30lb. son with toddler prefolds. The rise on this diaper is perfect. The width is pretty slim and the toddler prefold barely fits. The gussets are not gussets they are part of the bottom of the diaper for an older child. It works! The fit is the best that I have found for my 2 year old in a one size diaper because the rise is so generous. I am a happy customer. Pretty soon it will be passed down to baby brother and that is awesome.
I have used these all the way through with my baby, from birth to now, and just ordered a few more to diaper my little boy in, once he arrives in a few months. I will have two in diapers for a while, and think these work great. It is important to make them fit right or they will leak, but once I figured that out, I have fewer leaks then when I use disposables. My toddler seems comfortable in them, and she did when she was a very small baby too.
This is not my favorite cover, but it is the one that we got the best value from! I wish it was a touch more trim, but it hasn't leaked for us and you can't beat the price. I also love the bright colors.