I recently finished knitting this RIBBIE diaper soaker (cloth diaper cover). The pattern is in the testing phase and I was excited to knit this up and give feedback.
It is a one-size fits most cover, meaning that it should fit a newborn up to a toddler nearing the potty training age. The pattern was really easy to follow and was VERY fast to knit. The creator of the pattern also sells the finished product. If you'd like to buy one, go to her etsy store La Petite Krott Creations.
Here is the soaker on my 2 year old son:
I love the fit on him and because of the ribbing it has lots of room to grow (in all directions)!