Counting odd numbers by 2

I dont know about you but my child has been having a hard time with the consepect of counting by twos for odd numbers.  He knows the number two is even and when he thinks of it odd it's just confusing.

So I thought of a way to help him see even and odd numbers by counting by two's.  Since doing this he's picked up his even and odd numbers and now understands no matter where he starts counting from he skips 1 number.