...there’s a fantastic National Geographic book - IIRC The Little Kids’ First Big Book of Dinosaurs. I think someone mentioned it on here last year, so thanks for that, whoever it was!
It’s a big hardback, with huge full colour illustrations, plus an adult size figure to show how big they were, and plenty of info, but the pictures are the main thing.
I bought it last year for Gds, who was still only 3 at the time - he adores that book and knows the names of many which the rest of us had never heard of.