Baby Rattle

I know that adults have heads shaped like an arrowhead, eyes like cats and the rattle on the tail but how can you tell with baby snakes?????

I saw two snakes this morning but didn't kill them because I wasn't sure if they were rattlesnakes or not. Heads were sorta arrowhead like but not really.... the tails were long and pointy like non venomous snakes.

I still probably should have killed them because a rattlesnake bit my chihuahua in the face and if not for emergency anti-venom treatment he would've died. Cost us $1500.