I found this interesting from a comment on the Dallas Morning News site:
"Very sad. This child probably died of dehydration. I ride that route several times a week on my bike and rode past while he was there. It is too far off the road to hear a baby crying and not part of the main park. It is the worst place to leave someone hoping he will be found. This woman is pathetic."
So where he was is far from the road. Too far to see him, too far to even hear him cry. My experience with the area is overgrown and isolated as well.
This is SO sad. If I was that person I would rack my brain wondering if I had missed something important.