You can see the child that is making the noise in the video 0:35-0:45 walking infront of the place on the footpath between the street and Comet with what I presume is the childs parents.
I've also wrote up what i've collected into a pizzagate review. Currently focusing on the investigating the clinton foundation but if you'd like to corroborate research you can reach me at theonlinemick4@gmail.com
Good work, upvoted :)
I thought that at first too, but on a second viewing I realised that the pedestrians walking past with the child seem to be looking towards Comet as if they are trying to see what the child is screaming for. The kid with them looks to be very calm and not distressed, so I'm now doubtful that the screaming was coming from the passersby.