Lots of people are looking for dinosaur sheets. My favorites are the ones pictured here from PoshTots. But they're a little pricy, so you might consider others I've found from Walmart and other stores.
One of the interesting things when you start looking at this theme is the shortage of dinosaur crib bedding. Which surprised me. There just aren't that many options really. But that's OK. You can go with any colored bedding for a dinosaur theme and then use dinosaur decor and dinosaur wall decals to make the room dinosaur. And, check out the tons of options available as well in dinosaur growth charts.
Disclosure of Material Connection: Some of the links in the post above are affiliate links. This means if you click on the link and purchase the item, I will receive an affiliate commission, probably enough to get a stick of gum. I generally only recommend products or services on this blog that I would use personally and believe you will find cool as well. I am disclosing this in accordance with the Federal Trade Commission’s 16 CFR, Part 255: “Guides Concerning the Use of Endorsements and Testimonials in Advertising.”