Jim's on the 50th percentiles for weight and head circumference and 90th for length.

I have the red book too, but I figured out the graphs.

On the Head Circumference the increments are 1cm on the left side of the page the bolded line I mean;
at the bottom 3 months between each thingy,

On Length they are 5cm and go up in 1cm

On Weight they are 200g increments.

Hope that makes sense, but the charts are too small, they are silly.