Fact check: Video falsely claims to demonstrate lack of birth records for Uvalde victims

The claim: Video demonstrates there are no birth records for child Uvalde victims
A video circulating on social media purports to demonstrate there are no birth records for the 19 children who died in the mass shooting at Robb Elementary School, painting this as evidence that the shooting was supposedly staged.
The eight-minute clip begins with a slide that asks, "Uvalde School 'Massacre': Can We Find Evidence That Any of the Child 'Victims,' As Described, Were Ever Born?"
It appears to show searches on Ancestry.com and FindAGrave.com for each of the 19 youngest Uvalde victims. For all but one name,...