The developers recommend completing the entire questionnaire again, as there will be different questions at different intervals as the child ages. However, if it is a matter of a child not having experience with items or activities, such as never using crayons or pencils, you could just re-administer that domain in a few weeks after the child has had opportunities to practice. In general, re-screening is recommended in 2-3 months; however if you are especially concerned, you could re-screen sooner.