I'm around snakes all the time in the oil field. They will go about their own business if left alone. I had a 2 ft diamondback laying right at a lease gate yesterday,I just moved him with a stick,and it crawled off into the grass.
Snakes serve a great purpose keeping rodent numbers in check,and they will only strike at humans when they fear of being harmed.
Glad that toddler wasn't hurt too bad,pit viper venom is some bad stuff.