It's actually both it just depends what rattle snake you catch. hemotoxic venom causes swelling, destroys tissue, bleeding, and pain. The other is neurotoxic which is capable of paralyzingly prey
and yes babies are the most venomous since they don't know how to use their venom, but I just love all snakes in general
I caught a baby rattler at l. A national forest, almost kept it but my mom freaked and said no ;-; *sniffle* and never goes to the l.A reptile convention.