There are some really cute growth charts out there. Nascar, Thomas, and more.
My kids? Their growth was marked the old fashioned way, on the back of a door frame.* And now it's happened. My baby, Ernest (marks on the left), is taller than me (the 5'6" blotch in the middle). It happened some time between September and now. His pant legs and sleeves are all too short. And his voice got deeper during the 10 days we were gone. I can't chart that. I wish I'd been able to save the old cell phone message with his younger voice!
And Frank? (Marks on the right.) It's been over a year since he let me measure him. He's probably closer to 6' now.
*Surprisingly, the Handy Husband has allowed this writing on the wall. He has offered to take the trim strip off so I can save it. (His ulterior motive is so he can put a clean one up.) I'll transcribe it to paper some day, and keep it rolled up along with mine.