I am working on a project where in I need to the graph child weights at various points in a given child's life against the WHO standard growth curves. All of this is well under control, save for the fact that Access charts every day that the weight wasn't measured as a zero. Any suggestions?

To be clear: Y axis is weights, X access is age in days. And the data is a handful of series that correspond to the standard deviations, along with the most important data- the child growth measurements, which of course are null for all unmeasured days.