I've added a tool that generates a Fenton 2013 growth chart, plotting longitudinal data of weight, head circumference, and length, from data copy and pasted from a properly formatted Excel spreadsheet document. Care has been taken to make it possible to upload the data without sending protected health information.

For every point, it also calculates percentiles and Z-scores. There is color-coding to help recognize if the baby is losing weight percentiles over time. Weekly weight gain is reported, as well as the weekly weight gain that would be needed to maintain the current weight percentile.

This tool has been in clinical use at my institution for years now and has been very helpful as a facet of growth + nutrition quality improvement projects.