We have a lift-the-flap book and one of the pages shows flaps up numbered 1 to 20. Jessica impressed me by reading the numbers in order. Till we got past 10. Then she needed some help. She skipped 13, as she always does. I don't know if she's superstitious or that just happens to be a number she forgets. Then we got higher: 17-18-19....Ten-teen.
The same book also has a page with shapes. Did you know the shape of a stop sign is an optagon?