Before creating the worksheet for children, it is important to understand why the worksheet is being made. Is there a message to be conveyed? Can students record information that can be understood later? Is it being created to just teach a basic concept to little children? A well designed worksheet will make its objective clear. The different aspects that should influence the design of the worksheet are the age, ability and motivation of the students.
For example, if you are using a simple addition and subtraction worksheet with your child, draw or type up another sheet of with squares and numbers printed onto them. Instead of writing the answers to the questions on the worksheet you can get your child to cut and paste the required numbers for the answers from from the second worksheet onto the first.