When I bought this I didn't realize it was a POCKET fitted. What a great idea! So nice to be able to put an insert in it during the day and more heavy duty prefolds at night. I have never had a leak with this diaper under a cover, and that's what I love about fitteds - absorbency wraps around the baby. So no matter what, there is material there to absorb. The fabric is thin, which allows the diaper to be very trim. Obviously depending on what you put inside the pocket it will affect how trim it becomes. My son is 9 months, 19 lbs and he'll be able to wear these well beyond 1 year. Still lots of room in the rise and the waist at this point.