I like the brown around the dinosaurs it looks nice and what a neat idea.

I believe you have gotten good advice. Quilt it a little densely and the batting and backing will stabilize the top. Cute quilt, by the way.

Everyone else has given the words of wisdom above that I totally agree with. I mix prewashed with un-prewashed all the time and I use poly batting. I've never noticed any shrinkage, even in my Trip Around the World quilt made up of 2" squares. I always quilt medium densely. You have made a lovely quilt and the little guy is going to love it! :)

I used to prewash my fabric but not anymore. So my stash is a mixed bag of washed and non washed. I use them together with no problems. As others have said the quilting stabilizes it all. If you're nervous because someone else is paying for the materials do the suggested test. It sure beats taking everything apart. The quilt looks really great. Good Luck.

I like this pattern and I love this quilt.

Don't worry. I have misxed washed and non washed with no problem. cute quilt.