People are getting shot by toddlers on a weekly basis this year - The Washington Post
In 2015 so far, at least 13 toddlers (ages 3 and under) have inadvertently killed themselves with firearms, 18 more injured themselves, 10 injured other people, and 2 killed other people. And these numbers are likely an uncount as there are likely to be instances of toddlers shooting people that result in minor injuries and either no report or no media coverage.
It is difficult to draw broad conclusions based on these numbers, but in a study of accidental shootings by children of all ages, there are estimates that "more than two-thirds of these tragedies could be avoided if gun owners stored their guns responsibly and prevented children form accessing them."
#NotAnAccident Index
In a country where there are more guns than people, and where certain portions of the population are pushing for more guns in more locations, it is inevitable that a certain number of small children are going to get their hands on an unsecured firearm. It stands to reason that, if we want to limit those instances, we need to increase the amount of gun safety training or increase the gun safety regulations (like mandating gun lockups in home) or discuss gun liability insurance to help cover these injuries.