If you're teaching your children about how to make wudu then this Wudu Activity Book for Little Kids will take you through the steps. I've tried to make it as general as possible due to the different mazhabs. So take what you need and leave out the ones that does not apply.
Wudu is something that I wouldn't normally teach my prekinders as they are too young to learn the details of it. At this young age, I'd be more concerned with encouraging them to love praying. However, this book is a fun way to introduce young children to the concept of what wudu involves without enforcing the memorisation of the steps.