Of course the Brady Campaign faked numbers;

that and lying is what they do.
A leading gun control group included adults in death statistics used in a media campaign about toddlers.
...
The campaign’s ads exclusively use imagery of toddlers and young children, but some of its gun violence statistics include incidents having nothing to do with children.
Again.
The Brady Campaign pointed to a fact sheet published by its sister organization, the Brady Center to Prevent Gun Violence(see 'faking numbers and lying' above), to corroborate the statistic. The fact sheet claims “2,624 kids and teens die from gun violence” each year, based on analysis of a Centers for Disease Control database. The statistic counts the firearm-related deaths of everyone under age 19, from toddlers to 18 and 19-year-old adults.

The CDC’s 2014 National Vital Statistics Report records starkly different incidence of firearm-related death for children and young adults.

So, what do they do when called on this?  Lie again.
The Brady Campaign said its message is not confined to just toddlers, though the campaign’s website is named ToddlersKill.org.

Lying: it's what they do.