A rattlesnake's most distinguishing feature is its rattles, but baby rattlers don't have rattles until they shed their skin for the first time. Instead, the baby has a little knob – called a button – on its tail. When an adult rattlesnake feels threatened, it coils, rattles and hisses all at the same time. Young snakes may coil and hiss, but you won't hear a rattling sound. You shouldn't ignore the hiss of any snake, but it's a grave warning when coming from a rattlesnake, even a baby one. Baby rattlesnakes don't have as much venom as adults, but it's more potent., Young snakes may coil and hiss, but you won't hear a rattling sound. You shouldn't ignore the hiss of any snake, but it's a grave warning when coming from a rattlesnake, even a baby one. Baby rattlesnakes don't have as much venom as adults, but it's more potent., Baby rattlesnakes exhibit distinct features that set them apart from adults. At birth, they measure around 8 to 10 inches long. Their bodies display a slender, elongated shape. Unlike their adult counterparts, baby rattlesnakes lack the prominent rattle at the end of their tails..