yeah, I'm going to need more info as this case feels atypical to the usual "forgotten" baby cases we see here.
For now I can see this happening, if the young neighbor wasn't a normal person who had care and custody of this child, if the plan to leave baby in the car and return home to drop baby off with dad after the neighbor arrived back home, I can see the neighbor forgetting and just being on autopilot after arriving back home, getting out, leaving the sleeping forgotten baby in the car.
the headlines are deceptive because this doesn't sound like a babysitter. It's a ride that became a delivery service in an impromptu way it sounds like to me.
For now I feel sympathy with all involved. If more facts come out which show the teen neighbor was inebriated, on drugs, etc that could change. Right now this feels like an accident, with tragic, fatal results.
ETA I would want to know what time mom was dropped off and what time dad was expected to be there to receive baby.