There is no serious evidence for the "lack of control" idea in juvenile rattlers. However, they may compensate for their very small available doses of venom by injecting on a verage a greater proportion than adults.
The venom of juveniles of some snake species is more lethal than that of adults, and may differ in activity. In some Bothrops, for instance juvenile venom tends to have higher hemorrhagic activity but less necrotising activity than that of adults. However, the difference in lethality pales into insignificance compared to the massive difference in venom yield - adults produce VASTLY more venom than juveniles.
Clinical studies that have investigated this have generaly found that bites by larger snakes are, on average, more severe than those by smaller snakes, but nonetheless, a proportion of bites by juveniles ended up being very severe or even fatal as well - there is no room for complacency with any venomous snake, large or small.
Cheers,
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