Hi Suzanne, glad you were able to build new charts! We are still on an older version and can’t update our Fenton’s. Our nurses looked at WHO charts and expressed the same concern. It is very difficult to use them for newborns. Our doctors are still reviewing the tools. I personally advocate for Intergrowth-21. And the calculation tool is really great. I am putting in a product feature request with GE. Will update on the progress.