measuring

Hey, I'm wondering if anyone has any tips on measurement taking on a bp that doesn't like being held out. I've tried string, he hates it too. Also, I think he's within 20-22", is that an alright length for a 4-5 month old?

Use Snake Measurer.

A great program that allows you to take a picture of your snake next to an object of known size (coke can, ruler, etc) and then trace the snake to get a pretty accurate measurement.